You are trying to defeat the terms of your licence agreement with Keil - which they enforce by means of the hardware lock ("dongle").
If you need to use 2 copies of Keil on 2 different computers at the same time, you need to buy an extra licence (ie, an extra dongle).

[rant]
The Keil dongle is a horrible thing, and is likely to mess up the rest of your development environment (this is documented on the Keil site!)
They know that the US market won't stand for such nonsense - so if you buy Keil in the US, it come dongle-free!
[/rant]