In your original post you mentioned that you tried to install it 4 times but you never said what was happening that was preventing you from using the tool, did you get an error message during the install? If not please describe exactly what your experience was with the installation and what was not working.
If you are able to add this to another user's profile on the same machine it may indicate some sort of corruption with the previous users config folder. If this is the case then the only way to get it installed for the previous user would be to delete the config folder which would force you to re-install all of the extensions.