How to get Trillian for all versions of Mac OS X
Using Safari, visit the Trillian home page and click Download Now as shown below:
Installing Trillian from the Mac App Store
If you have Mac OS X 10.7 Lion (or Mac OS X 10.6.6 Snow Leopard)then you can install Trillian for Mac directly from the Mac App Store by clicking the download link on our home page, as shown above.
Installing Trillian for Mac without the Mac App Store
After you've clicked the Download Now link on the Trillian home page, Safari will download Trillian for Mac to your desktop or download directory. View the progress of the download in Safari's Downloads window. You may open your Safari Downloads window by pressing Option+Apple+L.
Click the magnifying glass in Safari's Downloads window. This will reveal the downloaded Trillian in your Finder:
Next, drag Trillian from your Downloads folder into your Applications folder (or wherever you want it, e.g. Desktop folder). This will install Trillian for Mac!
After you drag Trillian from your Downloads folder onto your desktop (or Applications folder) it is installed.
Double-click Trillian's icon to launch the app.
If you ever have a hard time finding Trillian, simply click the Spotlight Search in the upper-right corner of your Mac's display. Type in "Trillian" then choose the first result designated as an application.