To prevent e-waste and save these from landfills, you may use the procedure here to enable upgrades and remove the 5 AP limit from your ZoneDirector for use in a homelab or personal environment.
If you have a ZoneDirector 1000 or 5000 then you can still add AP Licenses.
Follow the instructions here: Add AP Licenses to a ZoneDirector
The appropriate patch [ZD1100/ZD1200/ZD3000] should be uploaded as a Software Upgrade (Administer > Upgrade > Software Upgrade).
The upload process completes the patching; no upgrade will be offered. Instead you will receive confirmation the patch has successfully completed.
Although the above patch can be directly downloaded and used, I recommend either creating the patch yourself [ZD1100/ZD1200/ZD3000] or decrypting the patch to verify it does only what it should.