After downloading, load M3K4_ 1.mds with virtual CD-ROM, and the system will automatically prompt whether to install the game. If there is no prompt, run m3k4update.exe.
Start the installation. When you are about 50% ahead, you will be prompted to insert 2CD, which means to insert the second disc.
At this time, regardless of the installation screen, switch to the desktop, take out M3K4_ 1.mdf from the virtual CD-ROM drive, load M3K4_2.mds, and then click Yes in the box prompted to insert, and the game will automatically continue to install.
After the installation, before entering the game, first load the file M3K4_PLAY.mds with the virtual CD-ROM, and then run the game icon. Never mind mdf files, they will run automatically when loading mds files.
About the specific usage of virtual CD-ROM drive, you can check it on the website and introduce it.
Good luck.