Customer purchased SO with original purchase but decided not to install with the original installation. Now they want to install SO but it doesn't come up as an option when you choose to add modules and no to new keys. So, went back a menu option and choose the new keys option figuring to enter the keys and proceed. But oh no, that would be too easy. Now I get an error message that the unlocking keys are invalid because we are trying to install to the wrong version. Say what? So, bypassing the keys issue for now, is there a file inside Sage to change to make it think SO is not installed? There was a SO folder on the server that we renamed to old, but that didn't work. SO does not come up on the installed modules listing. Version 5.00.4. Thanks.