Hello, is this thread still active, or has it been abandoned? Because I can't download any of the language packs from the links provided. Also, it looks like the final version of 26H2 has already appeared on UUP DUMP. I’d really like to have a tool to convert any edition to IoT LTSC. Of course, the best—and, in my opinion, simplest—option is to convert from IoT Enterprise to IoT Enterprise LTSC. But that’s up to the developers, since my wishes and what’s actually possible are two different things.
Don't combine packages of Client and Server into one Source folder. Proof? My 20348.1 failed for this. My 26100.1? I don't combine them. No problem. And don't combine amd64 and arm64 neither.