Yes, those 3 product license key will not work on Fences 5. You will need to purchase a new license key for Fences 5.
As for discount from Fences 4, you will get discount for Fences 5 sub. There is no discount currently offer for permanent license Fences 5.
For permanent license you will get free updates, not upgrade, for all future Fences 5.x releases. You will need to purchase a new license key for Fences 6 or any later number product upgrades.
Thank you,
Basj,
Stardock Community Assistant
