One of the benefits of subscription plans is access to previous versions of your software. Support* is available for all current versions of Autodesk software plus some previous versions. To be eligible for support, the Autodesk software must run on vendor-supported operating systems. If a vendor discontinues support for an operating system, we also discontinue support for Autodesk products running on that operating system, even if they are among the eligible previous versions. Furthermore if a vendor provides extended critical support plans for the discontinued supported operating systems Autodesk reserves the right not to extend support for Autodesk software on them For example Red Hat Extended life cycle support ELS is not considered a vendor-supported platform for Autodesk software
If a previous version isn't listed, support isn't available. To avoid downtime, upgrade to a supported version before a previous version reaches the end of support. An active subscription plan without lapse indicates that you can continue to use a previously installed and activated version, even if it has reached end of support. If you have a perpetual license for a version that has reached end of support, you still have rights to use the license for as long as you want.
However, for unsupported versions, you can't get a new activation code to reactivate that version for any device. We also do not release software updates or hotfixes for versions that have reached the end of support*.
*Support includes technical support, software updates, and hotfixes.