It is always a good idea to check out the release note prior to an upgrade so you can anticpate the consequence of upgrade:
Altium Designer presents new features and bug fixes on a monthly basis that will enhance your board design experience.
Solution Details If your licensing is on subscription, it allows you to use the latest version of our software. get installer for each version at, and follow instruction at !installing-multiple-instances-of-the-software Starting in Version: 18.0 It is possible to update existing version to a newer minor version (x.y.z to x.y+1.z+1), but to upgrade to a newer major version (x.y.z to x+1.y.z) or downgrade to any older major or minor version, a fresh new instance of that version has to be installed separately. As such, install/uninstall of each version can be done independently so long as you specify a distinct folder path at the time of installation. Multiple instances of Altium (same or different versions) can be installed concurrently on the same machine as independent applications, uniquely identified by hexadecimal GUID. Upgrade/downgrade one Altium version after another to compare features and behaviors across