You can download official versions of ZArchiver directly from the to ensure safety and regular updates:
To install an IPA file on iOS, you must use a sideloading tool. You cannot simply open the file like a standard app download. Below are the most common methods. Zarchiver Ipa Download
Enter your Apple ID email inside Sideloadly (this is sent directly to Apple to sign the app). You can download official versions of ZArchiver directly