To check for available upgrades for any of your programs, you need to log in first to your Topaz Labs Account, and then go to Account >> My Upgrades.
You can see on that page if there are any available Free Upgrades or Bundle Upgrades (Or Paid Upgrades for some programs starting from August 2020).
Here is how it would look like if you have any available upgrades (In this case it is a Bundle Upgrade):
Also, you can check out our Product Upgrade Policy by clicking here.
As for the last updates and versions, you can find them in our Topaz Labs Downloads Page.
If you can't find your answer here, please feel free to contact our Support Team.