XMM installs in a different folder and seems to be incomplete. Luckily XMM 9 still runs. XMM 10 does not start at all. Downloading the full version solves the problem. Even my database, which is in the 'old' folder is recognised. The lay-out of the new version is messy.
After I downloaded the full version of XMM 10 and installed that, it ran. However the grid view (which is the one I use) is totally messed up, nothing is showing. The thumbnail view seems to show everything, but everything in the grid view is blank. XMM 10 seems to be unusable at the moment. Fortunately 9.0.1.4 was not uninstalled and that still runs. I am somewhat wary of uninstalling XMM 10 as I am worried it might screw things up. XMM 10 needs work. After all this time with no updates 9.0.1.4 seemed to be getting a bit wonky and I was looking forward to an update but this isn't it.
OK I managed to uninstall XMM 10 and XMM 9 still works fine. I will wait for another newer version before trying again!