hi, maybe this was already mentioned and I missed it but could you use your own license already owned for Avast 2016 and use it for the 2017 Avast beta if so great and if not you should consider it for the users and just auto update to the final version why I say this is because I tested a few betas for other security programs that did this and you not only get more testers and input to help but you get the users that are already familiar and are already using Avast product and it makes it much easier to try the betas and be upgraded without uninstalling/reinstalling every time and thinking you only have a month license trial when you have say three year license of your own
You should be able to use the license without a problem.
There is no need to remove/install every time if you test it “the smart way”.
Use a VM.
Install a OS in it.
Create a duplicate.
Install the software you want to test in only one of them.
When done, delete that VM, clone the clean install etc.
That way you also prevent problems with the real time environment 
thank you the new beta looks very promising and I would be glad to help out with some input
mark