Unfortunately, it doesn't work. I made a brand new VCL application, just one form, I just dropped TSynEdit on it and tried to compile. The same error occurs. The latest version of SynEdit was installed using GetIt the day before yesterday and is marked 2022.03. I will try to uninstall now and reinstall. By the way, on the same computer I have Delphi version 10.4.2 with an earlier version of SynEdit installed that works properly.