When we’re creating Rescue Disc, the progress bar does not move while downloading.
I suggest it is included in the setup progress.
Besides, the text is very near to the bottom while there are so many empty space in the interface.
I suggest a better distribution of the UI components.
Yes, same behavior here, left system in this state for ten minutes, no change or update.
Seems fix is to disable avast self-defense yet again, then all works as it should. See sig below for current avast version.
I’ve recently installed Avast 12.2.2276 Free, on XP, and cannot get the Rescue Disk to create a USB. It says “Creating…” “Downloading toolkit…” for many minutes and then quits. I’ve tried disabling Avast Self-Defence Module and it does not help. There is no Evenlog file in C:\Program Files\AVAST Software\Avast\ and the latest modified file is in C:\Program Files\AVAST Software\Avast\setup but nothing with todays date. I have a lot of experience with creating bootable USB keys as both a user and a programmer, but it is sad there is no log file to even begin troubleshooting this issue.
Resurrecting an old topic is never a good idea. 
http://screencast-o-matic.com/screenshots/u/Lh/1470671059353-41034.png
And the creation completed successfully. Version 12.2.3126.2
I’m on Windows 10 v.1607 so it may have something to do with the fact that you’re using Windows XP
Actually, I resurrected this ~40 day topic because it was the most recent, and provided a solution that did not work for me. I see from your version 12.2.3126.2 on Win7 and my version 12.2.2276 that they are the same as I put the first part and you put the 2nd/Build part. Settings, About Avast actually shows “12.2.2276 (Build 12.2.3126.2)”.
Regardless, maybe the latest works for you but Avast may not be updating XP for this issue. I think my post was still a good idea because it clarified what might be working and what is not working.