If the cache clearing didn't work, the corruption might be deeper in the file structure. You can manually delete the folder where Steam stores these temporary archive files. Don't worry—Steam will re-download anything it needs.
The "SAK decompression failed" error typically occurs when using Switch Army Knife (SAK) sak decompression failed
For a visual walkthrough on updating keys and fixing attribute errors in SAK, watch this guide: If the cache clearing didn't work, the corruption
"Check the integrity headers," his partner, Sarah, said from the cooling racks. "Maybe the temporal encryption is fighting the expansion." If the cache clearing didn't work
4.3 Isolate Components