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I've been trying to install the game and continue to get the same issue. Once I get past the ToS and onto the actual launcher the progress bar reachs 9% then an error pops up. Basically, it is saying the MPQs.temp could not be renamed to MPQs. It goes on to say it also could not delete the MPQs.temp files either. Anyone have this issue too or know any fixes?
Support Forum Agent
Melthrius, this is a permissions issue where Windows or a security program won't allow the Installer to rename or delete files. There are several things you can try:
1) Right-click on the Diablo III Setup.exe, and "Run as administrator".
2) Run the Setup in Safe Mode with Networking.
3) Run the Setup on another User Account in Windows:
Windows Vista & Windows 7:
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