>>37859
I never tried downloading archives myself and assumed no one had problems as no one complained.

1. Make sure you download everything without errors, Endchan servers are often slow and drop connection, try different domains, use some sort of download manager with resume and retries. I use wget for such situations. For Windows there's https://motrix.app - I heard it's good.

2. Use 7zip to unpack if possible.

3. Archive extractor (WinRar or 7zip) needs to see extensions it understands to extract multi-part archives, make sure files you downloaded are named in proper order:
youtube_mirrr.7z.001 ... youtube_mirrr.7z.009

Web browser downloads them as raw binary blobs when you click on thumbnail, or copy link. This is how Endchan server stores them and how it generates markup for every thread; you need to click the filename link, which has a "download" attribute that gives each file it's original name instead of md5 string name.

4.I downloaded all parts just now, they extract without errors, so I assume problem is on your side. I should have provided hash sums originally for troubleshooting problems like this, but didn't. See list of SHA-256 hashes in the attached text file and compare to what you have. FYI, 7zip for Windows can compute SHA-256 and other hash functions as well.