[Zachery]

The license you purchase has an agreement with it.

You purchased your license during the vBulletin 3 era, which its license allowed for access to the software from the date of purchase plus 12 months. Before the end of term, or after the end of term, you had the option to purchase a renewal to extend that access for another 12 months. When the vBulletin 4 license was released, we removed the ability to purchase that renewal.

However, since you're on a "classic" or "legacy" license, you're still tied to that license agreement and terms. It did allow you to get access to any versions of vBulletin forum that were released while your license was active. Which would include early versions of vBulletin 4.

The decision to use, or upgrade to vBulletin 4 was on you. If you wanted continued updates, you should have been aware you would have needed to purchase an upgrade.

There is a reason we specific vBulletin 4 license, it is not the same as the classic license.