Arthur,
Regarding the Agent version, you can find information on releases here:
Windows: community.kaseya.com/.../726.aspx
Mac: community.kaseya.com/.../728.aspx
Linux: community.kaseya.com/.../727.aspx
If you visit each of these pages (ensure you are logged into the Community), scroll to the bottom of the page. In the lower right corner (below the long list of KB topics/articles) is an Options section. Within Options, click the "Email subscribe to this page" link (only visible when logged into the community).
Once you've subscribed, when this page is updated, you will receive notification. This can serve as a process to keep updated on agent updates - not just the fact that there's an update, but also some notations regarding the changes.
Brande