Reinstall on older android version

I just reinstall a fresh nexus 7 with android stock 4.4.4. Of course, I’m not able to install Yatse from play store (not on android 5.0+). I download apk version 8.9.0 on apkmirror and it works but I’m not able to get back my licence for the pro version (unlock with google play 3 years ago). When I click on buy now in Yatse, a message tell me the I already paid for that.

How I can get back my licence ?

Thanks

If it tells you that you already have paid then the licence should restore.

https://yatse.tv/faq/license-issues probably have your solution and in all case as the template says I need logs.