Can I request feature that Tixati create download folder defined in settings by itself?
Because now not existing download folder prevents Tixati from run, with modal naggy window that will not disappear until I manually create download folder.

One of this options will be fine:

1. Simply do not check folder existence (maybe optional with checkbox in settings), anyway you (proposed to) select download path each time you open torrent.
2. Tixati automatically creates folder if it does not exist at run (maybe optionally with checkbox in settings), if path (drive letter) not available - immediately opens folder select dialog (and only in this case).
3. Add button to modal window "Create download folder".


Situations in which this problem could occur:

1. Using Tixati portable on USB drive on different PCs, where you by any reason can not/do not want to download to standard %USERPROFILE%\Downloads folder.
2. Set download folder on external USB HDD or stick, and run Tixati when it unplugged or simply cleaned/formatted.
3. Using ramdisk and store download folder on it. After reboot folder disappear. I know that I could simply add bat file with "mkdir" to autorun, but it's better when software at its side suite more situations and do not require user manual workarounds.

I think this behavior is by design. When Tixati expects a path but does not have it, it errors.. So you can fix the problem without doing anything more than RT-> location -> folder location which keeps all the metadata.
Your solution would work if its a checkbox somewhere... I thought the PORTABLE mode already keeps everything under the same root folder the Tixati exe is in?

Portability doesn't solve any of situations I've described.

If Tixati portable is on USB stick and download folder is on PC, Tixati expect it existence at PC, not USB drive.
Again, if Tixati is on HDD and download folder is on Ramdisk - ramdisk cleaned after reboot and Tixati can't find folder.

Yes, it will be acceptable if it will be optional with checkbox in settings.