I have found the reason, why some of you we're unable to install the app. It's because some stock-maps related data are still present on the phone. It results in signature verification failure because the mod uses the same shared uid as the stock app and hence the certificate which is used to sign the mod doesn't match the certificate of the stock Maps. The package gets ignored then.
I have wiped everything, baked a fresh MCR r8 ROM and now everything is working flawlessly. So if you are experiencing the install issue, I suggest you backup your apps + their settings via Titanium backup (but don't include Maps in that backup), wipe /data, /cache & dalvik cache and then restore your backup. Or if you don't mind, you can just wipe & reinstall your ROM without Maps baked in and flash the mod afterwards.
I will update all the packages with the fixed version of the mod, downloads will be back soon.
Edited by squrl, 12 August 2010 - 10:14 AM.