If you have has problems with not being able to run the new map pack installer, please try running this test program and post your results.
http://mappack.deadm.com/DeadmSetupWx.exe
The test program is just the installer, it does not contain any maps. This is to test if the installer runs on everyones system.
Note:
Since the installer does not contain any maps you will get the error, "file is not supported archive" if you go through all the steps of the installer. This is OK, as long as the installer runs.
Thx