Some bugfixes are required for previous versions as well
I don't use the old version, but many companies have a perpetual license of the old version of 3ds max.
It's a good idea for them to subscribe to the latest 3ds max, but before that, it's also a good strategy to appeal to them how good the latest 3ds max is. As employees do not have the right to purchase, the latest 3ds max updates will not help them, and business owners will be dissatisfied with discarding existing licenses and purchasing new ones.
The bottom line is to deploy a service pack that fixes some big bugs and improves some performance. Of course it cannot be the same as the latest version. This can appeal to users that '3ds max is working for users', and will also contribute to maintaining the share of 3ds max users.
Companies that don't have the ability to purchase new 3ds max licenses can prevent the transition to other tools, and for companies that have the ability to purchase it will be a promotion of the latest 3ds max version.
