With Analog Factory, you indeed get only one activation code (one time use).
Without a Syncrosoft eLicenser USB dongle, you can only install on one computer, once.
If you want to use your software on another computer, or need to de-install / re-install the software, you should get a USB eLicenser dongle (from Arturia, or a Syncrosoft compatible dongle from Steinberg, Korg, IK, Vienna...) and store your license on the dongle.
Sean