2.Add option to detect comission's category, also introduce new dir structure
3.Check file size when download complete to prevent corrupted file
4.Add option to enable request cache
5.Add option to force check file size to detect corrupted file
6.Fix multiple edge case that will caused exception and corrupt file
7.Fix stack overflow in some cases
8.Add max tries limit when download
ability to add comments in username list with "#"
autoremoval of "_" in usernames
speedup filter checking
add basic indexing -> speedup existing file checking for newer files
other small changes