Illustrator CS5 re-install error: Install.app can't be opened.

Hello everyone,
Has anyone ever seen this error when installing Illustrator CS5 on Mac OS X Lion?
"Install.app" can't be opened. You should eject the disk image.
Things that might be related;
a) I've recently upgraded the hard disk. I restored everything from a TimeMachine backup
b) I had a few strange things happen with illustrator over the last few months. Yesterday I couldn't place .png graphics into a file, so I uninstalled everything and decided to reinstall from scratch.
c) My downloaded source (illustrator_15_1_LS1.dmg) was kept on a network volume. I assumed the error meant it was corrupted so I downloaded the source again from Adobe. I get the same error on the newly downloaded file.
d) Following a suggestion elsewhere in the forums, I tried Disk Utility > Verify Disk on my new hard disk. It found several permission errors which I let it fix. The problem remains.
I'd appreciate any suggestions on how I can solve this.
Many thanks
Steve

Solved
Short answer: OS X 10.7.4 (or maybe before) introduced an incompatibility between Illustrators install file and Mac OS X.
Updating to OS X 10.7.5 solves this.
Through this post on stack overflow:
http://stackoverflow.com/questions/11171246/why-does-os-x-10-7-4-want-me-to-move-my-app-to -the-trash
it directed me towards Gate Keeper functionality of OS X 10.8 having been enabled in updates in OS X 10.7.4(or earlier, not too sure). 
Running `sudo spctl -a Install.app/` gave the result CSSMERR_TP_CERT_REVOKED but the solution posted on stackoverflow of disabling gate keeper didn't work.  So I set off to find a way of inspecting the certificate. I didn't find instructions to read the certificate but that did lead me to read the apple site about gate keeper and that although it was introduced as a feature in Mountain Lion (os x 10.8) some features were provided for developers in Lion (10.7).
I thought I'd have to buy and install Mountain Lion but found that I hadn't got the latest Lion update.  I downloaded that, installed, restarted and now the installer works fine.

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