Photoshop CS5 disk?

Michael Morris
 

Unfortunately the main computer in my observatory has gone bang and I had to replace it. :-(
I'm slowly going through the long-winded and tedious task of re-installing all the software that was on my old machine.  However, I can't for the life of me find the installation disk for my copy of Photoshop CS5.  
Did I lend it to anyone in the society?

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