TMS Webcore Delphi 10.3

Our school uses Delphi 10.3. I have signed up for the webcore add-on, but the version for download seems to be for Delphi 10.4. I tried running the installer in any case, but I have no access to webcore within the IDE.

Could I possibly gain access to webcore for 10.3? Perhaps I am doing something wrong? Thanks