Hello Slávek,
there is also a repository for OpenSUSE Tumbleweed. See: http://mirror.ppa.trinitydesktop.org/trinity/rpm/osstw/
Many thanks, it works. I looked at the upper directory before, but didn't realize this subdirectory was for Tumbleweed :-).
And on related note, to help others I wanted to edit wiki page, but I cannot because my e-mail is not confirmed, and this is because of the error I have when I set e-mail address for wiki account:
Error sending mail: authentication failure [SMTP: STARTTLS failed (code: 220, response: 2.0.0 Ready to start TLS)]
And while I am writing about Wiki, the certificate looks like an expired one, when you enter wiki page, for example: https://wiki.trinitydesktop.org/OpenSUSEInstall
web browser will complain about security issue. For now adding security exception in browser works.
I will be grateful for any help.
Cheers,