By Mistake installed wrong update

I am using this software to manage my account. But while installing a latest update on windows I installed 64 bit instead of 32 bit. Now if I am trying to install 32 bit version it ask me to uninstall the 64 bit version, but the problem is that I don’t have backup file.
Please help me.

Your accounting data is not in the program. It is in a completely separate data file in your application data folder. See Manage application data folder contents | Manager. You can safely uninstall the Manager program itself at any time.