How do I install patch 1.4 if the game is not installed?

Of course, it needs to be registered! When installing the game (like any other program, except for small ones), it is registered in the registry, and the patch installation program uses this information to determine if the game is installed on the computer and where it is located. And when reinstalling Windows, the registry... In short, give that "someone" a good talking-to and tell them to return the disc. And you'll be happy.