Some time ago, Microsoft removed all support for the SecuROM copy-protection system from Windows 10 — And with good reason. There’s a serious security vulnerability in the driver software for it. But with that support gone, installing MSTS on Windows 10 has seemingly gotten more difficult.
It’s not as bad as it seems. The solution is fairly simple — copy the files from each MSTS CD into one single folder, then run the installer.
There’s one temp file that gets overwritten when you copy the files into a single location; it’s OK since that file does nothing for MSTS — it’s probably part of how the installer tracked CD-swapping, but it makes no difference now.
CD 1 will copy with no problems unless it’s dirty or scratched. CD 2 may take longer, and keeping it clean and un-scratched is important still. This is because SecuROM used fake errors and deliberately “damaged” track sections on CD 2, so it’s harder to copy. But, somewhat ironically, the built-in improvements to file copy integrity in Windows 10 will work as long as the disk and the CD drive is in good condition.
Once you’ve copied all the files into one single folder, run the installer. To be safe, it’s generally best to right-click and choose “Run as Administrator” just because modern Windows can be picky about things like that. Be sure to pick an install location that’s not in \Program Files\ or \Program Files (x86)\, of course.
The installer will run all the way through to the end, without stopping to ask for the second disk. After that, be sure to install all of the official Microsoft MSTS updates; that will bring your install up to standard and remove the dependency on having Disk 1 in the drive.
To keep your folder of copied files safe, it’s best to make a .ZIP file archive of them. Use your favorite file-compression utility or even the ZIP utility built into Windows with right-click > Send To > Compressed (zipped) folder. Make a backup copy or two of the .ZIP file and put your MSTS CDs away for safekeeping.