Two options-
1-The game, as you have chosen to install it, needs more than 180 Megs. To figure out how to fix that, read the README, paying attention to freesize under the mount options.
2-Did you mount a second drive for the game to be installed onto?

sounds a lot like 2-

Chainsoar, please repeat your steps here, meaning please write us what you write and execute in Dosbox.

I think it's number 1

Place your bets! 😉

Option 3) He didn't read my excellent 60-seconds guide.

What I did exactly, from the moment I opened DOSBox, was this -

mount D D:\ -t cdrom
D:\
install

Then when I click the option "Full install (55 megs)", to install at the destination C:\Crusader, it stops me with "not enough space on this drive". I've got more than enough space to accomodate 55 megs. What did I do wrong?

DosBox only shows 110m of free space for mounted C:\ partitions when you do a

"Mount c c:\games"

you need to add -freesize XXX after it

EX:

"Mount c c:\games -freesize 500"

What I did exactly, from the moment I opened DOSBox, was this - […]
Show full quote

What I did exactly, from the moment I opened DOSBox, was this -

mount D D:\ -t cdrom
D:\
install

You don't have a folder on your hard drive mounted as C:\ as far as I see. You have to do what Dosfreak tells you. After installing, the next time you start Dosbox, you don't need to add the freesize parameter, Crusader works fine without it.

Sorry, I still don't get it. I know how to mount my games folder, I'm having trouble installing the game from the CD. Am I being dense?

Now please tell exactly how you're mounting. Should look like
mount c c:\oldgames
mount d d:\ -t cdrom

In all of your previous posts you only mentioned mounting your cdrom, not your games folder.

In this comment you stated:

Then when I click the option "Full install (55 megs)", to install at the destination C:\Crusader, it stops me with "not enough space on this drive". I've got more than enough space to accomodate 55 megs. What did I do wrong?

DosBox only shows 110meg free on any mounted folder for compatibility for older games that do not expect to see gigabytes of free disk space. To override this you have to specify the "-freesize XXX" switch in your mount command when you mount your games folder.

just checked the installation. Crusader does NOT need the freesize parameter, BUT it shows the "not enough space" when there is nothing mounted as C:\.
So you better make use of that knowledge:

I know how to mount my games folder, I'm having trouble installing the game from the CD.

@Qbix: I win 😀

No you didn't, it was 3) 😀

grrrr...