More than likely, they are getting this problem instead. I’d suggest trying to install 8.0.100.70 and see if that helps.
It was caused by some other application installing a version of the runtimes that were incomplete or corrupted. I don’t think we ever tracked down where these incomplete runtimes came from. Because these had the same version numbers of the runtimes we needed to install, the installation was skipped. When ICU attempted to load, it failed because of the missing pieces in the runtimes.
Just the main entry - that should uninstall everything.
It should be okay to keep the settings.
I think a full install is needed to run the installer for the runtimes, but it couldn’t hurt to try Repair first.
However, I would try the first thing I mentioned before trying the steps in this thread.