Bad news, today I have received an email from the Play Store support:
Hi Developers at tagsoft After review, tTorrent Pro - Torrent Client, hu.tagsoft.ttorrent.pro, has been suspended and removed from Google Play as a policy strike because it violates the malicious behavior policy. Apps that cause users to download or install applications from unknown sources outside of Google Play are prohibited. ...
To comply with the policy I have removed the search plugin support from the Lite version, i.e. in app search is not possible anymore.
You can expect a new paid ad-free version without the search plugin support soon.
You can use a web browser to download torrent files or get magnet links from any site, and add them in tTorrent.
Now the ad free version is out, with the minimum possible price for now. I would like to give it for free for all the former Pro customers, I have asked the Play store support if this is possible somehow.
The answer was to use coupon codes per user. You need to contact the support email to proceed.