It works!!!!! Though not quite as I had originally intended. I tried hitting the modify button (almost literally) and then installing 1.5, but that didn't work. I then scroured the web for more possibilities and cames across a fairly old post in the Apothecary (which is where I should have posted this - ). It basically suggested changing the names of the folders so that one had the one I wanted to install a patch into should have the original file name and default directory, and the others should have new names. Whether this was a key factor I don't know because when I came to install it again I, after a few more failed attempts, I tried clicking the reinstall button...Eureka!!! The patch actually worked and installed into the default directory. Problem is, the 1.2 patch was installed in the other copy. Nevermind; it still worked, as did 1.5, which is excellent. I can now play RTR platinum. Thanks everyone for your support. The response I've recieved has confirmed that this forum actually rocks, and all the people who post on it are a bunch of genuine legends.

Cheers