I just want to use Delphi 10.3.1 Community Edition. When I want to start it, the License Manager says : It does not find a valid license for C++ Builder Community Edition.and the License Manager pops up again and again. When I ask a serial number for C++ Builder, the License Manager says : there cant be two community edition product on the same machine. If I launch Delphi with admin rights it works fine. But in this case the source file dropping feature does not work. There is no option to create a C++ project if I run RX. The OS is Windows 10 x64. Any idea?
Delphi CE and C++Builder CE are two separate products. You can't have them installed together on the same machine at the same time. If you want only Delphi, then install only Delphi. If you want only C++, then install only C++Builder. If you want both Delphi and C++, you need the full RAD Studio, or else install the CEs in separate VMs.
I just installed Delphi 10.3.1 CE. C++ Builder is just installed by RAD Studio 10.2. But it shouldn't be a reason.
You can't install the CE products alongside RAD Studio. Either you have the full RAD Studio, or you have a single CE product. Other combinations are not allowed.
But the version of the full version RAD Studio is 10.2, not 10.3.1. Could it cause the registration error as well?
You are right, I didn't notice you were using different major versions.
I have removed everything from the file system and the whole registry related to "RAD Studio 20" and reinstalled. Now it works like a charm.