The best things to do:
1. Download it and install again. The big advantage, you'll get the latest, 8.1 compatible, version if it exists.
2. Run the installer (program, msi) you saved after you downloaded it in the past. This, of course, is only possible if you did save it (which we recommend).
3. Copy the folder in Program Files it was installed in to the new PC, cross your fingers and try to run it. If it doesn't work, choose one of the two methods above.

Kees