It depends on what your meaning of "support" is. We only make fixes to the most recent version within a supported major version. We will answer questions and do some troubleshooting on issues in earlier versions, but any fix we make will be based on the latest version. So if you encounter an issue in 4.6 or 4.7 you won't be able to get a fix without upgrading to 4.9.2 first. See this page for more information on supported versions.

Upgrading with 4.x is simple: download and install the current version. Updates can be rolled back by uninstalling and then reinstalling the older version. You have to be on a maintenance subscription to get 4.9.x, however. See the upgrade topic. This requirement may be removed in the next 4.x release, but meanwhile if you're not on maintenance then 4.8 is the latest release available.

You can create a new adTempus 5 instance and use export/import to copy jobs from your 4.x instance. However, if you plan to move everything over and want to keep job history, it's generally simpler to copy the database as discussed in this article.

See the download page for the latest 5.x release.