HELP can't log in

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i have a account i was playing until v41 came out after that it wouldn't let me log in i've been out for awhile now i got a new clean copy of titanium in deleted all the files required and put the extracted contents of v41 into the file only launching from the launch titanium file but when i get to the login all i get is invalid username/password how can i log in here but not there im really confused