Translations of this page:
There are several ways to install third party .ipa files.
I tried via AltStore and Sideloadly. Only Sideloadly worked for me.
No Jailbreak required.
Check video guide: https://www.youtube.com/watch?v=vqTsavQc3lQ
In the final installation phase I had an error which I was able to fix with Force Restart.