I tried installing today, but it ate up nearly all my disk space, so I uninstalled.
Is it possible to install the program on my hard disk and the templates on an external drive?
The best angle to approach a problem is the try angle.
If you're getting that close on HD space, you may also want to consider a larger HD, or adding a second internal HD. You can also install programs onto a 2nd internal HD and they will operate just as if they were installed on the C: drive. Plus a nearly full HD will cause overall PC performance to suffer.
That does throw a bit of a wrench into the works.....you may need to do some housecleaning then if you have 25% or less of your hard drive free.