Is there a time limit for the use of ActiveBarcode? Does the license have to be renewed at some point?
No, it's a perpetual license so the use of the software is not limited in time.
I have tested ActiveBarcode. Now it shows that it's expired. What can I do?
The free trial has expired. You need to buy a license. You can choose from different licenses. Once a license is installed, the expired warning will disappear. The software does not need to be installed again for this. Installing your license will fix it.
Is it possible to upgrade to a higher edition?
Yes, that's not a problem. Please read the notes on the license upgrade.