The running version needs to be stopped first and thereafter the executable can be exchanged with a newer version.

If you are using several instances of License Server in failover mode, you can update them one by one. That allows for uninterrupted processing since at any point in time there would be two instances running (in a setup with three instances).

Of course all parameters such as a cachefolder need to be used with the new version as well.

Process Cartridges need to be updated to work with newer versions of the program (e.g. pdfToolbox). To do so you should have received an update License PDF using the same serial number as the Cartridge to be updated. You can then update the Cartridge (as usual) with --cartridge and --install.

Credits Cartridges can be used with all versions and do not have to be updated at all.