You want to know the procedure to upgrade Edge SWG from 6.7.5.x to 7.3.x and all necessary steps to avoid some issues during upgrade
Edge SWG 6.7.5.x
1.This step is mandatory if you are upgrading the SGOS major version, such as 6.x to 7.x Convert SGOS Configuration Settings
2. If appliance doesn't have Internet connection make sure to update license with manual upload Manually Update the License
After upgrade
3. If appliance not using policy services run command in cli using SSH console
enable
configure terminal
# (config) policy-services
# (config policy-services) disable