Each extension can be ONLY used with Lagom WHMCS Client Theme (opens new window) license to which they have been assigned. This applies to all extensions except "Module Integrations".
Before you will be able to activate Lagom Extension, you have to assign it to correct Lagom WHMCS Client Theme license.
If you decide to activate Extension for different Lagom Client Theme license, you can easily done that by fallowing the same steps as above and assigning Extension to different license.
You need to rememebr that change of license assignment will deactive extension on previously assigned license.