This is a specific example of how to install Repligator manually as a plugin for a paint program. The sequence will be similar for most paint programs.
You have to create a Ransen Software folder under the plugin directory of Photostop. Step 1 is to find that folder, Step 2 is to create the Ransen Software folder:
Step 3 is to copy Repligator15.8bf into the RansenSoftware folder, so it looks like this:
Most paint programs require a similar sequence of steps for installing plugins manually.