Note about all v6 upgrades
Do you run the "worker" under a service account (not LocalSystem)?
IMPORTANT NOTE: those who are running the “worker” system service under a different account (not System or LocalSystem) will need to re-configure the service to run under such account after upgrading from any version number <= 6.1.12)
Upgrading from v6.x.y is a simple and fairly automatic process: simply download the latest version from the official download page, and install it over the existing version, all of your settings and license will be kept.
If, instead, you’re upgrading from an older (v4/v5) version, you find the upgrade instructions in our knowledge base.