When you open some of the older builds of Song Surgeon Version 4, you may see a message
about needing to re-register.  Please try that. If it doesn't work, then here is the solution.

Close the program, uninstall it, and then download and reinstall
the last of the version 4 builds. Here is the link for that.

Win http://songsurgeon.com/files/SongSurgeon4.msi

Mac     http://songsurgeon.com/files/SongSurgeon4.dmg

After doing that please open and try registering again.  If this doesn't fix your problem
please complete a Help Desk Ticket