It's probably a good idea to use XAMPP when you're wanting to add new features to your websites. This way you can test things offline before uploading the changes to your live site! I also had to use XAMPP to convert Zippy Promotion to UBB Threads since I had to use an old version of phpBB to convert to then finally an old version of UBB Threads. Most old versions of software won't function properly since they usually require an older version of php.
