Anyone else failing to install 12.2.1?

Not had this problem before - a slew of errors when trying to install 12.2.1. Here's a screengrab of the first:

http://ift.tt/1KSp2pJ

Then a gazillion more missing files. The installer zip seemed to download and unzip normally. Had first uninstalled 12.2, then tried to install 12.2.1. Have abandoned for the moment and put 12.2 back.

EDIT - ah nuts, it's broken 12.2 now as well. System Restore don't fail me now...

EDIT 2 - ah double nuts, System Restore failed. PT crashing on first attempt of loading every time. Uninstall everything, reinstall and pray.