Shoom'lah,
I have been posting these instructions in other threads. I might as well post it here as well.
As I have mentioned in a similar threads, MOUL can be run natively on the Mac without the assistance of Bootcamp or Windows Virtual software. If you need a blow-by-blow description of all the various ways to achieve this, the specific post you'll want to look at is
Rainbow's. However, if you are looking for the easiest solution (in my opinion) to getting MOUL up and running on your Intel Mac, doing it yourself by hand using the following instructions paraphrased from Rainbow should get you up and running MOUL on the Mac without loading additional software and without too much fuss.
1. Download the
old Mac client from Gametap, mount the disk image, and copy Myst Online.app to your Applications folder (or, if you played MO:UL years ago on your Intel Mac and saved a copy of the app, use that, because it already contains most of the assets the game needs and you won't have to download them again).
2. Download the UruLauncher.exe file
here.
3. Replace UruLauncher.exe in /Applications/Myst Online.app/Contents/Resources/Myst Online.app/Contents/ Resources/transgaming/c_drive/Program Files/Uru Live with the new copy.
Once you have the new UruLauncher.exe, how do you put it inside Myst Online.app? You can do it in the Finder:
In the Applications folder, Control-click
Myst Online.app. and highlight "Show Package Contents". In the resulting window, go into Contents, then Resources, then Control-click again on this
Myst Online.app. Again navigate into Contents > Resources > transgaming > c_drive > Program Files > Uru Live. Drag the new UruLauncher.exe from wherever you put it on your hard drive into this folder and replace the old one.