Test the installation on Windows 10 with SDcard install.
Just got a new Windows 10 tablet. Installed Maps Pro on the SD card (64Gb). At first the install failed until I discovered that the SD card slot was defective and intermittent. Once I got that fixed I could not install Maps Pro again, so I uninstalled it. Next I tried to install Maps Pro on the C drive (standard install). The install failed every time. The SD was not in the machine. I went through the registry and deleted any key/data that had "MapsPro" in it. Reinstalled perfectly. Obviously the uninstall did not completely clean up the SD card install.