This is actually going to depend on your license for Autodesk Software:
- Perpetual License
- For new versions, you will at this point have to buy an entirely new license, which will be a subscription license. In this case, you would not need to uninstall the older versions that are on perpetual licenses.
- Upgrades to Perpetual Licenses
- This one is trickier and doesn't apply to current versions of course, but if you previously paid for upgrades, either through maintenance or one time upgrades of perpetual licenses, then you were allowed to keep a certain number of previous releases and that varied. Prior to the policy change, it could be as many previous releases as you wanted.
- Subscription (Current Licenses)
- Subscription or Flex - Single-User/Multi-User
- Current Version and 3 Previous versions as a general rule, but there are some exceptions, see the table at:
- Students and Educators as well as Educational Intuitions
- Current Version and 3 Previous Versions
Some of Autodesk's newer software is enforcing this by requiring you to uninstall older versions than your license allows before installing and others will just stop working if your license doesn't allow its use.
Please note that you can in some cases get special permission from Autodesk to use older versions and your licenses would be updated to reflect that permission, but that is usually temporary and under unique circumstances. And use lessons learned here, do not run older versions than you are allowed to do unless you have that permission.
