If you want to change your server, please follow the following steps:
Note: In the RISE v3.9.5, we've added an option to disable the license from the Settings>Updates. So if you want to use the same purchase code on another site, please disable the license first. After moving successfully, save the purchase code in the Settings>Updates page and remove the old installation. For the earlier versions of RISE v3.9.5, there was no license disable option; you just remove the old installation.