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I made an update to yt-dlp for Vista, while also applying the diff's we discussed (_video.py changed a bit, due to an error). Furthermore, I found a PyInstaller 6.15.0 for Vista here (whl) and used that with success. (didn't work on XP...)

... Well, after yt-player 2b83d2e0-main, Google are now serving 377ca75b-main, which is equally BAD ; but @nicolaasjan, I just made, what I think is, an important discovery, at least where a "no-Deno' yt-dlp setup is concerned; it would appear my efforts to restore iOS format support in yt-dlp were not in vain; iOS formats ARE NOT IMPACTED by the inability of the native JSInterp to handle yt-player 2b83d2e0-main and later; I just used your 2025.08.20.60440 build (compiled with py3.9 and the last to support iOS formats without supplying a POT string) and here's the outcome: yt-dlp --extractor-args "youtube:player_client=ios" -vF "O5TS2CbBhKo" [debug] Command-line config: ['--ffmpeg-location', '<redacted>\\FFmpeg', '--downloader-args', 'ffmpeg:-v 8 -stats', '--extractor-args', 'youtube:player_client=ios', '-vF', 'O5TS2CbBhKo'] Deprecated Feature: Support for Python version 3.9 has been deprecated. Please update to Python3.10 or above [debug] Encodings: locale cp1253, fs utf-8, pref cp1253, out utf-8 (No VT), error utf-8 (No VT), screen utf-8 (No VT) [debug] yt-dlp version nicolaasjan/yt-dlp@2025.08.20.060440 (win32_dir) [debug] Python 3.9.13 (CPython x86 32bit) - Windows-Vista-6.0.6003-SP2 (OpenSSL 1.1.1w 11 Sep 2023) [debug] exe versions: ffmpeg n6.1-dev-2615-N-112499-ga76b409 (setts), ffprobe n6.1-dev-2615-N-112499-ga76b409 [debug] Optional libraries: Cryptodome-3.23.0, brotli-1.1.0, certifi-2025.08.03, mutagen-1.47.0, requests-2.32.4, sqlite3-3.37.2, urllib3-2.5.0, websockets-15.0.1 [debug] Proxy map: {} [debug] Request Handlers: urllib, requests, websockets [debug] Plugin directories: none [debug] Loaded 1839 extractors [debug] [youtube] [pot] PO Token Providers: none [debug] [youtube] [pot] PO Token Cache Providers: memory [debug] [youtube] [pot] PO Token Cache Spec Providers: webpo [youtube] Extracting URL: O5TS2CbBhKo [youtube] O5TS2CbBhKo: Downloading webpage [youtube] O5TS2CbBhKo: Downloading ios player API JSON [debug] [youtube] O5TS2CbBhKo: ios client https formats require a GVS PO Token which was not provided. They will be skipped as they may yield HTTP Error 403. You can manually pass a GVS PO Token for this client with --extractor-args "youtube:po_token=ios.gvs+XXX". For more information, refer to https://github.com/yt-dlp/yt-dlp/wiki/PO-Token-Guide . To enable these broken formats anyway, pass --extractor-args "youtube:formats=missing_pot" [youtube] O5TS2CbBhKo: Downloading m3u8 information [debug] Sort order given by extractor: quality, res, fps, hdr:12, source, vcodec, channels, acodec, lang, proto [debug] Formats sorted by: hasvid, ie_pref, quality, res, fps, hdr:12(7), source, vcodec, channels, acodec, lang, proto, size, br, asr, vext, aext, hasaud, id [info] Available formats for O5TS2CbBhKo: ID EXT RESOLUTION FPS | FILESIZE TBR PROTO | VCODEC VBR ACODEC MORE INFO --------------------------------------------------------------------------------------------------------------- sb3 mhtml 48x27 0 | mhtml | images storyboard sb2 mhtml 80x45 1 | mhtml | images storyboard sb1 mhtml 160x90 1 | mhtml | images storyboard sb0 mhtml 320x180 1 | mhtml | images storyboard 233 mp4 audio only | m3u8 | audio only unknown Untested, Default, low, IOS 234 mp4 audio only | m3u8 | audio only unknown Untested, Default, high, IOS 602 mp4 256x144 12 | ~ 2.55MiB 89k m3u8 | vp09.00.10.08 89k video only Untested, IOS 269 mp4 256x144 24 | ~ 5.55MiB 193k m3u8 | avc1.4D400C 193k video only Untested, IOS 603 mp4 256x144 24 | ~ 5.06MiB 176k m3u8 | vp09.00.11.08 176k video only Untested, IOS 229 mp4 426x240 24 | ~ 10.22MiB 356k m3u8 | avc1.4D4015 356k video only Untested, IOS 604 mp4 426x240 24 | ~ 8.23MiB 286k m3u8 | vp09.00.20.08 286k video only Untested, IOS 230 mp4 640x360 24 | ~ 23.51MiB 818k m3u8 | avc1.4D401E 818k video only Untested, IOS 605 mp4 640x360 24 | ~ 14.13MiB 492k m3u8 | vp09.00.21.08 492k video only Untested, IOS 231 mp4 854x480 24 | ~ 41.82MiB 1456k m3u8 | avc1.4D401E 1456k video only Untested, IOS 606 mp4 854x480 24 | ~ 22.32MiB 777k m3u8 | vp09.00.30.08 777k video only Untested, IOS 232 mp4 1280x720 24 | ~ 72.92MiB 2538k m3u8 | avc1.64001F 2538k video only Untested, IOS 609 mp4 1280x720 24 | ~ 33.23MiB 1157k m3u8 | vp09.00.31.08 1157k video only Untested, IOS 270 mp4 1920x1080 24 | ~138.27MiB 4813k m3u8 | avc1.640028 4813k video only Untested, IOS 614 mp4 1920x1080 24 | ~ 50.15MiB 1746k m3u8 | vp09.00.40.08 1746k video only Untested, IOS ... and: yt-dlp --extractor-args "youtube:player_client=ios" -vf 234 -N 2 "O5TS2CbBhKo" [debug] Command-line config: ['--ffmpeg-location', '<redacted>\\FFmpeg', '--downloader-args', 'ffmpeg:-v 8 -stats', '--extractor-args', 'youtube:player_client=ios', '-vf', '234', '-N', '2', 'O5TS2CbBhKo'] Deprecated Feature: Support for Python version 3.9 has been deprecated. Please update to Python 3.10 or above [debug] Encodings: locale cp1253, fs utf-8, pref cp1253, out utf-8 (No VT), error utf-8 (No VT), screen utf-8 (No VT) [debug] yt-dlp version nicolaasjan/yt-dlp@2025.08.20.060440 (win32_dir) [debug] Python 3.9.13 (CPython x86 32bit) - Windows-Vista-6.0.6003-SP2 (OpenSSL 1.1.1w 11 Sep 2023) [debug] exe versions: ffmpeg n6.1-dev-2615-N-112499-ga76b409 (setts), ffprobe n6.1-dev-2615-N-112499-ga76b409 [debug] Optional libraries: Cryptodome-3.23.0, brotli-1.1.0, certifi-2025.08.03, mutagen-1.47.0, requests-2.32.4, sqlite3-3.37.2, urllib3-2.5.0, websockets-15.0.1 [debug] Proxy map: {} [debug] Request Handlers: urllib, requests, websockets [debug] Plugin directories: none [debug] Loaded 1839 extractors [debug] [youtube] [pot] PO Token Providers: none [debug] [youtube] [pot] PO Token Cache Providers: memory [debug] [youtube] [pot] PO Token Cache Spec Providers: webpo [youtube] Extracting URL: O5TS2CbBhKo [youtube] O5TS2CbBhKo: Downloading webpage [youtube] O5TS2CbBhKo: Downloading ios player API JSON [debug] [youtube] O5TS2CbBhKo: ios client https formats require a GVS PO Token which was not provided. They will be skipped as they may yield HTTP Error 403. You can manually pass a GVS PO Token for this client with --extractor-args "youtube:po_token=ios.gvs+XXX". For more information, refer to https://github.com/yt-dlp/yt-dlp/wiki/PO-Token-Guide . To enable these broken formats anyway, pass --extractor-args "youtube:formats=missing_pot" [youtube] O5TS2CbBhKo: Downloading m3u8 information [debug] Sort order given by extractor: quality, res, fps, hdr:12, source, vcodec, channels, acodec, lang, proto [debug] Formats sorted by: hasvid, ie_pref, quality, res, fps, hdr:12(7), source, vcodec, channels, acodec, lang, proto, size, br, asr, vext, aext, hasaud, id [info] Testing format 234 [download] Sleeping 6.00 seconds as required by the site... [hlsnative] Downloading m3u8 manifest [hlsnative] Total fragments: 45 [download] Destination: <redacted>\yt-dlp_py39_x86_Vista_onedir\tmpk84x9e_f.tmp [debug] File locking is not supported. Proceeding without locking [download] 100% of 85.49KiB in 00:00:00 at 322.60KiB/s [info] O5TS2CbBhKo: Downloading 1 format(s): 234 [debug] Invoking hlsnative downloader on "https://manifest.googlevideo.com/api/manifest/hls_playlist/expire/1758778311/ei/Z3_UaMSQCbqJsvQP9fWLqAI/ip/46.12.130.133/id/3b94d2d826c184aa/itag/234/source/youtube/requiressl/yes/ratebypass/yes/pfa/1/goi/133/sgoap/clen%3D3899667%3Bdur%3D240.907%3Bgir%3Dyes%3Bitag%3D140%3Blmt%3D1746948952157345/rqh/1/hls_chunk_host/rr1---sn-4vguioxu-n3bz.googlevideo.com/xpc/EgVo2aDSNQ%3D%3D/met/1758756711,/mh/yJ/mm/31,29/mn/sn-4vguioxu-n3bz,sn-nv47znel/ms/au,rdu/mv/m/mvi/1/pl/18/rms/au,au/initcwndbps/1085000/bui/ATw7iSUOzEWQ6PX6VYYXLkiO7dzFE3xfmcHfZoFK_8S7hMjX1ycDlaPakTSxUuOy0Qdqy7c6PbpJMvb6/spc/hcYD5W3kgO0onbxgfMF8TXKcbK3UkBVFobHYr7hkRDzJ46gEuEdvlNnyX7juBw6M/vprv/1/playlist_type/DVR/dover/13/txp/5318224/mt/1758756313/fvip/4/short_key/1/keepalive/yes/fexp/51552689,51565116,51565681,51580968/sparams/expire,ei,ip,id,itag,source,requiressl,ratebypass,pfa,goi,sgoap,rqh,xpc,bui,spc,vprv,playlist_type/sig/AJfQdSswRQIhAKM-l416Kpd36plAWO6JIVM79VLGBfbD_7oO__YVX9NfAiBMbZJDeQvoNol-G_1XYy9SoBez9b9X2HvWTwAUVb_h3Q%3D%3D/lsparams/hls_chunk_host,met,mh,mm,mn,ms,mv,mvi,pl,rms,initcwndbps/lsig/APaTxxMwRgIhAPQ4OhatAi1gQBDxujrZ_djlRX9gpWtt3d-a_QNog5AeAiEA9Q8QhO5Ua_aP270AbFi5qbD8TG2jzWVVIh9XSyBz5Vo%3D/playlist/index.m3u8" [hlsnative] Downloading m3u8 manifest [hlsnative] Total fragments: 45 [download] Destination: Love and Money - Halleluiah Man (HQ Audio) [O5TS2CbBhKo].mp4 [download] 100% of 3.75MiB in 00:00:04 at 811.59KiB/s [debug] ffprobe command line: <redacted>\FFmpeg\ffprobe -hide_banner -show_format -show_streams -print_format json "file:Love and Money - Halleluiah Man (HQ Audio) [O5TS2CbBhKo].mp4"

Small add to that list from me Gaming Steam: Latest version Win10 -> Vista+ (win32 made hotfix of ss that allowed work steam on vista) Need some workaround Geometry Dash Latest version Win8.1 -> Vista+, but on vista u need to put xinput1_3.dll into folder with game and rename it to xinput1_4.dll, also needs 2015-2022 vs redist