The plugin has a change log built in. On the plugin's Home page, the version card shows which version you are running and whether an update is waiting, and there is a Changelogs link under Help and Support that opens the full history.

Entries are marked so you can skim them: blue for something new, orange for a fix. A fix usually carries a second line saying what it used to do wrong, which is the fastest way to tell whether the thing that was annoying you has been dealt with.

The version you are actually running is highlighted, so you can see at a glance how far behind you are.

The same change log is published on the DNR website, so you can read it without opening SimHub.

To update, press Check update on the Home page. The plugin downloads the new version, closes SimHub, installs, and reopens on its own. There is nothing to download manually and no code to enter. When it is finished the card reads Up to date with a green tick.

If you are chasing a specific problem rather than browsing, it is worth asking support directly. Known issues with a current release are tracked separately from the change log and the answer will be more direct.