The Leasey installer has now been modified to take a backup of any existing JAWS scripts prior to installing Leasey.
Prior to installation, a message box appears stating exactly where those scripts are being backed up to so they can be easily located.
In the event there is a difficulty with the installation, assistance can be then given to revert back to the previous installation and configuration of JAWS.
However, as stated in the documentation, if additional script files have been installed before Leasey, or extensive configurations made, it is worth checking to ensure there are not going to be any conflicts. Worse case scenario is that you can be assisted to merge any existing configurations into the Leasey product. It is always wise to check first. It is not going to cost you anything to ask.