You don't need to delete and reinstall the game, just delete those files in the piggs folder, client.chksum in the City of Heroes folder, then run the NCLauncher and choose repair from the options you get when you right click on the City Of Heroes button on the left side of the launcher screen.
NCLauncher is the only way we have to get the game. While the staged install that allows you some limited play while it is installing is occasionally flaky, stalling out while downloading, just letting it install without trying to play the game does work. Of course I'm assuming you are trying to play it on a Windows PC and not a Mac or trying to get it to run under Linux. I only have experience with Windows.
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I actually ended up using msconfig to disable avg, and steam, than rebooted. After this I was able to install the game with no problem on the first try.
It must have been avg causing a conflict is what I figure. I guess disabling it through the main program was not enough.
I have tried 10 times now to get this game installed. The launcher downloads files, but when it tries to install them I get crc errors. The errors are always on the same 3 files, fonts.pigg, bin.pgg, and stage1.pigg.
Is there a place I can just download the full client? I can't believe they don't have a working installer for this. How do they expect to earn money when the game won't even install?
Deleting and reinstalling does not help. It always fails with the same error on the same 3 files.
Edit - Yes I have tried disabling my antivirus software during the download and install process and still get the same error on the same three files.