If you are on the 3.0.x release of JROX Affiliate Manager, follow these steps to upgrade to version 3.1. Version 3.1 of JAM supports PHP version 7, up to 7.2
Download the updated version, from our site:
http://my.jrox.com/downloads/jam.zip
First, backup all of your data, including your files and do a database dump. You can do a database dump using your web hosting control panel, or through the JAM admin area, under Settings > Global Configuration > System > Database Backup > Backup Now
Make sure to download the folllowing files from your old installation folder:
Once you have uploaded it, go to your JAM admin area, under Settings > Global Configuration and click on the "Check for System Updates" button to run the database table update utility. This runs the /import/jam_updates.php file for any database scheme updates.
Once that has finished, make sure to delete the /import/jam_updates.php file if the script cannot delete it for you.
If you have a custom theme done, make sure to upload those folders / files to the /themes/main folder.