Can I install iOS 11 beta ipsw using iTunes without paying $99? I want to go for beta, but OTA updates are quite buggy, and on top of that, my phone doesn't see ota updates with beta profile installed.

So I found ipsw image about 2,4GB, that I can download. If I flash that rom via iTunes without enrollment of my Apple ID, will I be able to use that beta?
The free public beta program seems much safer and more reliable than trusting a download and/or needing to jailbreak.


https://beta.apple.com/sp/betaprogram/