Installation on Macbook and iMac

Yes - you're allowed three installations as long as you only use one at a time.

-- Mike

That would be my answer too , only yesterday I found out that they are also specifying restricted use other than that , quote EULA :

3.3 Licensee may install and personally use the licensed software on three devices (e.g. one computer, one laptop, one workstation), provided that the said software is used only on one device regularly. Simultaneous use on more than one hardware device is not permitted. The Products may not be used on a network by multiple users, unless each user possesses a license. In case Licensee changes the hardware, all software on the hardware used must be deleted.