SOLVED: 7-Zip data error when extracting RAR files

I purchased VSCO2 today and so far I’m very satisfied with the sounds! However, an error keeps occurring while installing the software, causing some instruments to not play (no samples are present for e.g. the pipe organ and some brass). I managed to track the error down to what seems to be an extraction failure in 7 Zip:


I purchased VSCO2 through Best Service and followed the instructions from there.

What can I do to remedy this? I already redownloaded and reinstalled it twice and rebooted the computer to no avail. Thanks in advance!