Welcome to the Magix Sound Forge users community @Donald-Taylor,
Login to the "Magix Service Center" and download your SF version(s) from 'My Products' ..or.. if you already have SF installed on another PC, You can copy /paste the unpacked <.exe> installer file(s) from "Documents\MAGIX Downloads\Installationsmanager" over to another PC if... the files were not deleted after the installation was completed. As you are probably aware, you can have SF activated on two (2) PCs simultaneously.
You can also download and install the trial (demo) version, but you will not be able to use it without a valid activation serial code.