adding devices

hello, i get an ‘error 100 internal server error’ message when trying to send email link to add another android device to my account, pls advise. I have 3 PC license.
trying to add two android tablets, a HUDL and Kindle fire… when downloading from website and trying open the download in either of these devices I also get an error message…

https://forum.avast.com/index.php?topic=180687.msg1278807#msg1278807