Thank you so much bc22.
You're such my lives saviour and I feel so happy now. 
My problems are already solved.I am using Brave Browser now and not using Firefox anymore.And It can added to my Rutorrent v3.9 now!
Apparently Firefox have an issues here with gaytorrent.ru and not my client.
And again Thank you much.
I really appreciated it.Cheers 
I am using Rutorrent v3.9 on both my seedboxes and at my home connection.
I also did the reset passkey and try downloading new .torrent file.
But the result is the same.I am stuck right now. 
Hi,
Greetings to all of you,
Is there any issues that you have faced before or now that when you are downloading .torrent file from the site are invalid and cannot be added to your client?
Currently I having this issues when downloading every .torrent file and already message the moderator but still my problem cannot be solved.
I still be a little bit of sad because I cant download anymore from gaytorrent.ru.
Can you guys help me?