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yes it is always an issue because GetLogicalProcessorInformation is missing in XP SP2. you may either update kernel32.dll with that API available(i.e. WindowsXP-KB936235-v2): http://kmeleonbrowser.org/forum/read.php?19,143253,page=10 or patching your target application with kernelxp and patchk32. https://github.com/roytam1/rtoss/tree/master/kernelxp a patched SP52 running on just-installed XP SP2 VM: or unpatched SP52 build on WindowsXP-KB936235-v2-x86-ENU installed XP SP2 VM:

I would also be interested in reports from people who use Windows XP on more powerful computers. As always, my results come from my old, underpowered Windows XP computer, which simply refuses to leave me. But this computer is perfect for diagnosing such errors that you might not notice on more powerful computers. The offline installer can't be found on Panda's homepage. Here is a website where you can get the old offline installer of version 21.01.00: https://panda-free-antivirus.sooftware.com/windows/download/338378 You have to enable the checkbox "Offline installation" during installation. After finishing installation, the programme won't update to a more recent version, even when the automatic update function of the programme under settings is in use. Thanks for the hint! But I don't think the issue has already been fixed. However, one should definitely take a close look at the new "Legacy Installer", if available.

I suppose your investigation results are quite valuable to XP SP3 users on old and under-resourced H/W; so, thanks for your time spent ; however, unless one had downloaded to disk v21.01.00 when it was still current, it's now a real task to find working/valid links to actual (off-line) installers to it ; I did a simple G-search for it and ALL results on pages 1-3 point to (mostly) stub or off-line installer-links hosted on the vendor's (PANDA) servers; but these tend to download the latest version of the software, not the older one we're after ; I did succeed in the end in finding links to offline installers for v21.01.00, but these were self-hosted on Iranian and/or Russian sites, so, as you can understand, I won't share them publicly here ; other than that, is there a special setting one should configure in v21.01.00 so that it doesn't auto-update to a more recent version? FWIW, v23.00.00 has now become the latest (digitally signed 22/12/2025) ... Kindest greetings.

I'm sorry, somehow I thought I'd just normally decompress them instead of installing them. :-) Since MilkChan has built those fine update packages, I'd say SSE (b5107) for slower computers and SSE2 (b6912) for faster. Could you please test both and see which is faster. I think b5107 might be faster (it is also the last build in non-ESU fully updated Server 2003 x86).

New build of Serpent/UXP for XP! Test binary: Win32 https://o.rthost.win/basilisk/basilisk52-g4.8.win32-git-20251225-3219d2d-uxp-fd19819276-xpmod.7z Win64 https://o.rthost.win/basilisk/basilisk52-g4.8.win64-git-20251225-3219d2d-uxp-fd19819276-xpmod.7z source code that is comparable to my current working tree is available here: https://github.com/roytam1/UXP/commits/custom IA32 Win32 https://o.rthost.win/basilisk/basilisk52-g4.8.win32-git-20251225-3219d2d-uxp-fd19819276-xpmod-ia32.7z source code that is comparable to my current working tree is available here: https://github.com/roytam1/UXP/commits/ia32 NM28XP build: Win32 https://o.rthost.win/palemoon/palemoon-28.10.7a1.win32-git-20251225-d849524bd-uxp-fd19819276-xpmod.7z Win32 IA32 https://o.rthost.win/palemoon/palemoon-28.10.7a1.win32-git-20251225-d849524bd-uxp-fd19819276-xpmod-ia32.7z Win32 SSE https://o.rthost.win/palemoon/palemoon-28.10.7a1.win32-git-20251225-d849524bd-uxp-fd19819276-xpmod-sse.7z Win64 https://o.rthost.win/palemoon/palemoon-28.10.7a1.win64-git-20251225-d849524bd-uxp-fd19819276-xpmod.7z Win7+ x64 AVX2 https://o.rthost.win/palemoon/palemoon-28.10.7a1.win64-git-20251225-d849524bd-uxp-fd19819276-w7plus-avx2.7z Official UXP changes picked since my last build: - Issue #2306: Implement WeakRef functionality (5eab8c0aff) - Issue #2306: Add pref-gated WeakRef with safe stub when disabled (5895253f46) - Issue #2306: Fix spacing (b9ded9c3dc) - Issue #2306: Remove unneeded addition of streams_ in ContextOptions() (d43e57f885) - Issue #2306: Add test js (c171ddeace) - Issue #2863 - Part 1 - Update patches for ICU 78.1 (53662b13d8) - Issue #2863 - Part 2 - Filter ICU data for build (d5bcbfd06b) - Issue #2863 - Part 3 - Patch in non-dll suppression (fe4deee340) - Issue #2051 - Part 3 - Use pre-built big-endian ICU data file for big-endian builds. https://bugzilla.mozilla.org/show_bug.cgi?id=1264836 Disable unused ICU code during build. (7299df4737) - Issue #2863 - Part 4 - Use recommended ICU build options flags. (759d7984c7) - Issue #2863 - Part 5 - Update reading source objects (35cb857c80) - Issue #2863 - Part 6 - Make ICU with multiple jobs for faster rebuilds. (72f6135946) - Issue #2863 - Part 7 - Don't delete files now that they're filtered (c8491cff14) - Issue #2863 - Part 8 - Add note to run `make_intl_data.py langtags` (5a3d10212f) - Issue #2863 - Part 9 - Retain util_props.cpp (a8a1c5c250) - Issue #2863 - Part 10 - Add New Line Breaker Entries (afa02844dd) - Issue #2863 - Part 11 - Remove no longer needed locale maximization when removing likely subtags. (b31a7165e5) - Issue #2863 - Part 12 - Filter SCRIPT_CODE extensions from CLDR (25caba3df9) - Issue #2863 - Part 13 - Remove non-IANA Zones (77f1baf2ce) - Issue #2863 - Part 14 - Update switch to handle new UNumberFormatFields entries. (f47df7a663) - Issue #2863 - Part 15 - Update special casing script (98fc5db142) - Issue #2863 - Part 16 - Update locale canonicalization algorithm for changes from CLDR 39 (3f06fa4c2a) - Issue #2863 - Part 17 - Update ICU source to 78.1 (a29a80493f) - Issue #2281 - Remove the use of non-standard namespace std::tr1 in Google's WebRTC gtest code (cf85580d6e) - Issue #2863 - Part 18 - Update Unicode in Spidermonkey (852e690460) - Issue #2863 - Part 19 - Update CLDR to 48 (666b590bd4) - Issue #2863 - Part 20 - Update special casing in Gecko (ec13c2746d) - Issue #2863 - Part 21 - Update Unicode property data in Gecko (42d7950b0c) - Issue #2863 - Part 22 - Update tzdata source to 2025c (929b21c718) - Issue #2863 - Part 23 - Update tzdata in Spidermonkey (f728497818) - Issue #2863 - Part 24 - Remove special-casing for Etc/UCT (c77fea8760) - emoji-17.0 - Update Twemoji font to unicode 17.0.0 (36a295e4ef) - Issue #2857 - Implement `inset-block` and `inset-inline` CSS shorthand (5a832a6e24) No official Pale-Moon changes picked since my last build. No official Basilisk changes picked since my last build. My changes picked since my last build: - icu: restore pre-NT6 codepaths by reverting to old version with fixes, and fix v141_xp build (9f6727874f) Update Notice: - You may delete file named icudt*.dat and icu63.dll inside program folder when updating from old releases. * Notice: From now on, UXP rev will point to `custom` branch of my UXP repo instead of MCP UXP repo, while "official UXP changes" shows only `tracking` branch changes.

aaah, no clue whats wrong here: 0:26.17 c:/devel/myUXP/intl/icu/source/i18n/messageformat2_function_registry.cpp(862): error C2280: 'icu_78::message2::StandardFunctions::Plural::Plural(const icu_78::message2::StandardFunctions::Plural &)': attempting to reference a deleted function 0:26.17 c:\devel\myuxp\intl\icu\source\i18n\messageformat2_function_registry_internal.h(248): note: compiler has generated 'icu_78::message2::StandardFunctions::Plural::Plural' here 0:26.17 c:\devel\myuxp\intl\icu\source\i18n\messageformat2_function_registry_internal.h(248): note: 'icu_78::message2::StandardFunctions::Plural::Plural(const icu_78::message2::StandardFunctions::Plural &)': function was implicitly deleted because a data member invokes a deleted or inaccessible function 'icu_78::LocalPointer<icu_78::message2::StandardFunctions::Number>::LocalPointer(const icu_78::LocalPointer<icu_78::message2::StandardFunctions::Number> &)' 0:26.17 c:\devel\myUXP\intl\icu\source\common\unicode/localpointer.h(343): note: 'icu_78::LocalPointer<icu_78::message2::StandardFunctions::Number>::LocalPointer(const icu_78::LocalPointer<icu_78::message2::StandardFunctions::Number> &)': function was implicitly deleted because 'icu_78::LocalPointer<icu_78::message2::StandardFunctions::Number>' has a user-defined move constructor and v141_xp seems to be not good enough to build ICU 78. EDIT: got it fixed, -std:c++17 is needed by new ICU, so vc2015 branch will no longer be buildable as ICU can't be skipped. EDIT2: the above error is solved by adding a copy-ctr line in localpointer.h, all changes are in https://github.com/roytam1/UXP/commit/9f6727874f81bf98ef3f54f046d14c6c5cfdc20f , and hope I did it right. I think I can make a special release tomorrow! And now I have a newer-than-mypal ICU and feodor2 may have a look?

it is fine as long as DLLs are newer than 3 Dec, as I don't rebuild whole thing.