Hi,
Can you please post more details about the problem you see?
What is the error message?
The reason that typemock.dll is in the gac is technical and is related to the way the Isolator works.
Typemock.ArrangeActAssert.dll is just a standard reference and there is no reason for it to be in the gac. You should make sure that the 'Copy Local' property of its reference is set to true so it will in the same folder of your test assembly.
That been said if you really see no other way you can still install Typemock.ArrangeActAssert.dll in the gac from the command line using the following command:
>> gacutil -i <PathTheIsolatorInstallationFolder>Typemock.ArrangeActAssert.dll