For now, Tyreset only offer you the opportunity to choose the gp4 path if no gp4 key reg is found in the registry.
But in your case and as i wrote in the gp4form (that everybody has surely readen
, the last installation will be choose automatically by the app.
So the simple way to make the app let you choose the path to gp4 is
1-wait for a new release with a button to do it
2- just go in your start Menu and choose execute, then type in regedit.
In the hive tree, choose
HKey_local_machine\software and delete the whole Infogramme hive.
(Don't be afraid, tyreSet , like Cameditor will recreate it perfectly)
Then just launch Tyreset or CamEditor and choose tha path to the gp4 installation you want to edit.
Cheers