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Win10 21H2 was not entirely EOL (only the home & pro editions went EOL in mid-2023 but the enterprise & education editions of 21H2 will go EOL in mid-2024) guess that's why I like using LTSB/C releases (I run ltsc 2019 & ltsc 2021 which have much longer support)
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24H2 got released in the release preview channel for windows insiders in late May https://blogs.windows.com/windows-insider/2024/05/22/releasing-windows-11-version-24h2-to-the-release-preview-channel/ also, OP has yet to tell us what kind of CPU/processor that person is using. SSE4.2 support was first added on the Nehalem series (1st gen Intel core) of Intel CPUs and also started with the AMD Bulldozer & Piledriver series of AMD CPUs (the FX series). any old Intel & AMD processors before these series do not have SSE4.2
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are you running Win11 24H2 on a modern UEFI system or non-UEFI (legacy bios) system? modern UEFIs block unsigned drivers, especially on modern Intel based UEFI PCs with Intel PTT (platform trust technology) enabled
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not worth it
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so where's the video about this? btw, latest Firefox 125 version was 125.0.3, released on April 29 - a day after you made this post
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well the only way to "fix" your problem is with "trial and error" methods such as either replacing the whole PSU as mentioned in the following threads: https://h30434.www3.hp.com/t5/Desktop-Hardware-and-Upgrade-Questions/Hp-Compaq-Elite-8300-SFF-psu-graphics-upgrade/td-p/5743592 https://h30434.www3.hp.com/t5/Desktop-Hardware-and-Upgrade-Questions/Power-Supply-Upgrade-for-a-HP-Compaq-Elite-8300-CMT/td-p/6928080 a youtube video link on how to replace the psu on the hp elite 8300 or replacing the entire motherboard https://forums.anandtech.com/threads/hp-compaq-elite-8300-small-form-factor-installing-new-board-processor.2580369/ and test again with the replacement components. sometimes, there's no easy way to tell but to use such trial-and-error methods
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it's not just Google Chrome alone that will require CPUs with at least SSE3 Microsoft Edge is also following suit with the SSE3 requirement starting with Edge version 126 https://www.neowin.net/news/microsoft-is-ending-edge-support-on-computers-without-sse3/ https://learn.microsoft.com/en-us/deployedge/microsoft-edge-supported-operating-systems
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Speaking of Chrome 120, official Google Chrome 120 stable just came out (build 120.0.6099.62/.63)
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the 2015 ltsb version isos are still online after doing various google searches
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looks like Windows 10 could have an ESU program similar to what occurred with Windows 7 a few years ago https://techcommunity.microsoft.com/t5/windows-it-pro-blog/plan-for-windows-10-eos-with-windows-11-windows-365-and-esu/ba-p/4000414 https://learn.microsoft.com/en-us/windows/whats-new/extended-security-updates
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i wouldn't count on it now
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eh maybe use either W10 LTSB 2016 v1607 or recent LTSC 2021 v21H2. LTSC 2019 was based on the buggy v1809 release (though recent CUs for LTSC 2019 make it nearly stable), which one other person in another forum deems that version "half baked" KB5031427 is the very last security only update for Server 2012 R0 / Windows 8 and KB5031407 is the equivalent security only & very last SO update for Server 2012 R2 / Windows 8.1. Microsoft is no longer producing any more new security-only updates for Windows Server 2012 / Windows 8.x beyond those two updates.
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109.0.5414.165 x64 EXE (non-MSI) installer link
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and need to be running a 64bit edition of vista and the HDD or SSD must be formatted with GPT partitions for UEFI booting