ZIP FILES - FILES CAN'T BE FOUND

Just wasn't sure if you were receiving them through email or other methods besides a download direct from the vendor.

Definitely try using another web browser.

Are you using any browser extensions? If so, then perhaps they are interfering with the file especially if they are looking for a virus or malware.

Are you using any anti-virus apps, or cleaning/optimizer apps, or third party security software? If so, then uninstall them by following the developer's instructions as they are not needed on a Mac and they usually cause more problems than they solve.

If using another browser does not help, then you can try booting into Safe Mode which should prevent interference with afore mentioned types of apps, but I've been told with that this may not be as effective with Ventura due to recent changes. If Safe Mode prevents the issue, then you know that you have some third party software interfering with macOS.

You can also try creating a new macOS user account, logging out of your current user, then log into the new user account to try downloading & opening the Zip file there. If this works, then you know the issue is with some configuration of your main macOS user account so it narrows down the search for the problem.

Did you install any third party software for opening archive files or are you using the default built-in macOS options?

How are the files being sent/acquired? What app is involved in downloading the Zip files? If you are using a browser to download these Zip files, then try using another web browser such as Firefox or Vivaldi.