1. I suggest backing up your AHX file in any case, just to be sure.
2. You should be able to run the upgrade directly over what you currently have installed, it will update the program and any plugins you have.
3. If you have any older (non-SoftStart) Lamp modules (or dimming wall switches), you will need to re-define them within AHP to make them work right. There is a separate "module type" for the older (non-softstart) modules.
Use this simple test to determine which type your lamp modules (and dimming wall switches) are:
a. Turn the light on, using a hand-held controller or from the AHP software)
b. Watch what the light does. If it comes up to full brightness immediately, then it is the older (non-softstart) type. If it slowly ramps up to full brightness (takes a second or two), then it is the new (SoftStart) type, and you don't need to change anything in AHP.