Blue Iris

When you buy the Full Version for instance, for how long is the license going to be valid? Do you need to renew every year or something like that?

And is it possible to upgrade to new versions with that license?

Hi, the licence is valid for a long time, no obvious end point. It will also give you 12 months of email support, and 12 months of updates.
After that, you can just keep using it, but if a newer version contains something new that you want, you would have to pay for a 12 month support plan.
Some people don't have a support plan. Some get it to cover a wanted release. Some just pay annually. Your choice