I'm still in 1.36 and can't install GlenDonnach neither (hola, Chris!); I'm going to try your workaround, Moon_Willow, thanks for posting it!
So far, I had to install it by extracting the biggest .package with the Multi-Installer, and to rename it .world, and then put it in the InstalledWorlds folder, but it failed too. :(
The download page says it contains two items from the Store (I can't get the GlenDonnach page showing up right now, but they're listed when you click on the "store" link, near the little Premium Content icon).
EDIT: Cleaning the Sim3pack did the trick! I finally could install that beautiful world! Thank you!
