which tutorial was you using?
you need to understand that with mount command, dosbox simply replaces your real patsh with imaginary ones, so the games would think it's the imaginary
for example mount c: D:\dosgames\ would make things that run in dosbox think that stuff in directory d:\dosgames is drive C.
if you want to install something it doesn't need any special treatment if you are gonna run everything in dosbox. its just gonna put stuff physicaly on your drive directory with dos games that has been mounted, while it will act like it's located simply on C: (or differently chosen) drive. and you will acces it as C: as well.
so wanna install a game? no problem, act like it was a normal dos system, just know that the files will be stored elsewhere, there where you mounted it
btw if you want to mount a cdrom drive use mount x: y:\ -t cdrom command, where x: is what is your virtual cdrom gonna be called like and y: what is the patch to the real location that will act like a cdrom in dosbox
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