As announced, the LMD 2021 platform release only supports Delphi / C ++ Builder / RAD Studio XE2 or higher.
We would like to point out that, in contrast to previous version changes, the previous version 2020 will be supported until further notice and we will publish hotfix versions (no feature updates) at least until the end of 2021. Subscription customers of the VCL Complete versions can still receive them afterwards (GIT repository or via source code deliveries).
A current license always includes access to earlier versions (e.g. 2020 to get support for compilers up to Delphi / C ++ Builder 6). If necessary, contact sales with the required product version. This will then be activated also in your customer account.