Hi Alain,
My name is Tom, and I work for Typemock.
If you could answer a few questions to give us a better understanding of the issue, that would be great.
1. At what stage are you getting the DLL error?
2. Can you provide a screenshot of the error?
3. Can you also please run this command to install Isolator with logs enabled?
msiexec /i [path to installer] /L*V [save path for the log]
I am sending you a private email so that you can send me the screenshot and logs there, as well as continue the discussion.
Best,
Tom Milchman,
Typemock Support Specialist
EDIT: This issue was fixed by installing Isolator with admin privileges.