Sep 27
In Snow Leopard if you try to install a program while another is installing you get an error message saying “Waiting for other installations to complete.” But what do you do if the message stays there after the program has finished installing?
Today I was stuck with this message even though there was no installation in progress.
I deleted the following 2 files from your Library/LaunchDaemons and it fixed the problem.
com.apple.RemoteDesktop.PrivilegeProxy.plist
com.apple.RFBRegisterMDNS_RemoteManagement.plist

I have this problem. These files do not exist!
Same here. None of the files exists but still hangs
Didn’t work (files are in the /System/Library folder, btw); “sudo killall installd” did. Restart should also resolve it.