The Lindens have announced a faster installing viewer: Project Zipper Viewer. See the SL Blog announcement: Try Project Zipper for Faster Viewer Installation.
The download is: Project Zipper Viewer version 18.104.22.1686810.
I am expecting a surprise to arrive any day. This release would seem to be part of the infrastructure change needed. It might also indicate why the surprise’s arrival is taking longer than expected.
I’ll test the new install process if I can fin d the time. But, there are a number of things to play with just now. Plus there is some real life work intruding on my play time.