If you’re faced with this The archive is either in an unknown format or damaged issue, you can try our recommended solutions below in no particular order and see if that helps to resolve the issue.

Unfortunately, WinRAR doesn’t have an auto-update feature, so users will need to download and install the new version manually to fix this 'high' severity flaw. If you use WinRAR, it’s time to update.

Users are advised to upgrade their WinRAR installations to fix two high-severity flaws that attackers could exploit to execute arbitrary code. The RAR archive format, which is associated with WinRAR, ...