whenever I try to download a torrent with many files let say 50 or more, Tixati always went to "not responding" and never start responding after that. I have to manually close it through task manager and then restart. Is there a files/torrent limit in tixati? if no, then why this is happening. Can anybody suggest me a solution?

Some time ago I have been downloading a torrent containing a few thousands of files. Tixati worked fine except it took a lot of time to check for files after program restart. Maybe it's a problem with slow file allocation, on Settings > Local Files set File Allocation to Sparse Files, see if it helps.