Lightroom Won't Activate on Mac

I run Lightroom on a Mac G4 867 DP at home.
I also had a demo version of LR running on my laptop, which is a MacBook Pro.
It has passed the expiration period and now asks me to activate. When I attempt to activate with my purchased license serial number for my home license, it doesn't let me go any further. It simply keeps prompting me to activate/update my personal info with Adobe.
Do I need to de-install and reinstall again? Or am I not entitled to run it on both my home and portable (not concurrently)?
Any help is appreciated.

10.7.3 is the current version of lion, so yes, your system is Lion.
And there isn't an iMessage app, only a beta version of Messages which is essentially the same thing

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