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First, thank you for uploading a Mac version. I tried downloading it, but the resulting zip file (Backrooms_Summer_Update_Mac.zip) was invalid, and couldn't be extracted with any tool I tried. I downloaded the Windows and Linux versions, but couldn't extract those zip files either.

You're welcome. I'm very sorry; I zipped those with windows (compress option), If this has anything to do with it; does that mean I should  zip it with Mac too??

for a workaround, try this.