If you tried installing or repairing ReSharper 4.5, you might have received the following error:

A network error occurred while attempting to read from the file: C:UsersJeffreyDownloadsReSharperSetup.4.5.1231.7.msi

The cause of this was a path mismatch error.  Because my first download had failed, I downloaded the file again, and the browser downloaded the file with the filename of “ReSharperSetup.4.5.1231.7 (1).msi”.  The setup program somehow has the original filename programmed in, and the setup could not complete if the file was renamed.  That’s fine if it’s communicated, but the error message didn’t help me fix the problem.  I had to use my programmer intuition to guess why this was happening.  I guessed right, renamed the file, and everything was fine.