I was lucky enough to find the original Wolfenstien: Spear of Destiny complete in box at Goodwill - I think I paid 1.50 for it. Aside from all the original documents (ee!) it came with 3 install 3.5 floppy disks.

So I use dosbox to install like this:
mount a A:\

...and because you can't mount an entire drive I use:
mount c C:\spear
...to a folder I made earlier called spear in the c directory

Then I change directories to A: and type INSTALL. I get to the install screen and it asks what directory (C) and what path (/spear). This ends up making a file path of C:\spear\SPEAR, which is sloppy, but is required and I think shouldn't be a problem.

The problem happens shortly after I define the install path when it says:
"Disk in source drive is A_DRIVE - please insert disk SPEAR 1 [Esc to abort], any key to continue..."

The disk spear 1 is in the drive, heck, that's what brought up the install screen to begin with. When you push the key to continue it just brings up that message again. I double checked the disk name in windows and it sure is SPEAR 1, and the other disks are SPEAR 2 AND 3. Taking the disk out and putting it back in doesn't work. Any ideas?