WHEN UPGRADING A PRODUCT FROM A PREVIOUS VERSION...
Before upgrading a module to a newer version, please make sure the service period of your license has not run out. Trying to upgrade with a version released after this date will invalidate your license key.
Be sure to verify in Configuration > License Key and Details, your "Maintenance Expiration Date" BEFORE upgrading the module. If this date is previous to the date of the release you would like to install, once installed the module will NOT work.
If you have a Perpetual key, it will work forever, it does not expire. What the "Maintenance Expiration Date" rule is the period in which you can get free upgrades.
If you have installed by mistake a new version invalid for your "Maintenance Expiration Date", uninstall the module and install an older version suitable for your service period (stated by the "Maintenance Expiration Date").