As David Millington just blogged, there is a third patch for Delphi 10.4 available in GetIt. It is quite relevant to install it for most customers, as it addresses core issues -- for Delphi developers a problem in the VCL with TGrid and derived classes.
Installation is manual like it was for patch 2, and we recommend installing the 3 patches in sequence. This additional patch, along with the previous ones, adds significant stability to 10.4. In the mean time, we are focused on a quality focused udpate for 10.4.1.