I downloaded the 2018 FRC update suite and extracted all the files. When I try to run setup an error pops up saying “ An internal Windows function returned an error.” I tried restarting it and it did not resolve the issue. I tried running as admin and it did not solve the problem.
It looks like others have run into the issue as well. Without knowing your system configuration or anything I'd guess it has something to do with the download. To try to eliminate the low hanging fruit try the following.
-Make sure you unzipped the installer
-Try downloading a new installer or trying on another computer, if it works note the differences
It looks like in the past it was a corruption of the download or something with windows causing the issues.