Error verifying intergrity of file

[Knightedshadow]

Project Reality randomly crashed for no reason during the middle of a game, and now whenever I try to launch it I get this message about this error:
"1312: Error verifying the integrity of the following file: C:\desktop\project reality\mods\pr\levels\assault_on_mestia\client.zip"

It tells me to reinstall Project reality, but that would take an entire day with my internet, and I would really prefer another solution.
Thanks

[Mineral]

https://www.dropbox.com/s/jed7td7yri1gg ... t.zip?dl=0

that's my zip file. Just remove yours and place that one instead. Hopefully it's only one corrupt zip.
It goes in <pr installation>mods/pr/levels/assault_on_mestia/

Also, it's pretty bad practice to install /programs/games on the desktop. Should really not do that.