On Windows the location is determined by the environment variable TEMP. If you haven’t modified this environment variable, it will point to C:\Users\[your username]\AppData\Local\Temp\. In order to locate the crash log, open the Windows Explorer (Win+E) and type %TEMP% into the path bar. The name of the crash log be the same as your project file, but with the file extension .crash.txt. If you haven’t previously saved the project before, it will be blender.crash.txt.
The search %TEMP% doesn’t bring any results.
Is it possible the file is located in a different folder?