How to Mount Discovering America?
 

So I'm trying to mount Discovering America

http://www.abandonia.com/en/games/335

It has some basic instructions, but could someone give me a step by step? I'm doing something wrong, because I can't get it to work.

Uncompress the folder (da)
Run dosbox, mount your virtual C and input:

mount a x:\path\da
a:
install


Accept C
Accept c:\discover
Let the installer run, you'll get a lot of LHarc's SFX ............ file listings
It will leave you in c:\discover
input discover to play

Next time you wanna play:
mount your virtual C and

cd discover
discover


Should you still have problems be more detailed about what you do, OS?
Be more detailed please, really.