First, download and unzip the attachment.
Then run "RAD Studio Delphi Tokyo Rio 10.3.1" and browse to the following file:

Then you should install it as shown in the following image.
After doing this, you have nothing to do about CEF4Delphi.
You do not need to create a lib file for CEF4Delphi or anything else.
Everything becomes automatic due to the component installation action.

Click image for larger version  Name:	CPP_Builder_CEF4DELPHI_INSTALL.png Views:	0 Size:	96.0 KB ID:	26