Files like "CBFT Patch21.rar" are often flagged by antivirus software or Windows Defender because they modify executable files. Before downloading or running such tools from third-party forums or file-sharing sites, ensure you are using a reliable source and have verified the file's safety, as these patches are unofficial modifications.

: Copy the CBFT-Patch.exe (extracted from the .rar file) and paste it inside the actual ChessBase program folder.

: Right-click the patcher and select Run as Administrator .

Example for Fritz 17: C:\Program Files\ChessBase\ChessProgram17 .