I am on a Mac (10.7.5) and have tried to install Lightroom 2. It doesn't install. Would be grateful if someone could let me know how can I get it to install on my Mac? Thanks

that's not compatibile.

from Adobe - Adobe Photoshop Lightroom 2 : System requirements

Mac OS x

• PowerPC® G4 or G5 or Intel based processor
• Mac OS X v10.4, 10.5 or 10.6
• 1GB of RAM
• 1GB of available hard-disk space
• 1,024x768 display
• CD-ROM drive