Instead of having to go crazy, I might as well just ask.  What is the simplest way (using Zero edit or BF Builder, etc.) to make a tat2.lvl that has multiple AT-ST's for the Imperials: e.g. at the market place or warehouse inside Mos Eisely?

I need help opening Zero Editor on my PC.  It keeps saying "you must have Star Wars Battlefront installed for Zero Editor to work on your computer".  I ran both SWBF.exe and the SWBF opening link icon files (like the text suggests) but to no avail.  (And I did put BFbuilder in the Lucas Arts folder.) Please someone give me advice: as I love Star Wars Battlefront 1, and the only real reason I downloaded  BFbuilder (w/ zero editor) was so that I can put AT-STs at the market place and warehouse at the Mos Eisley level map; plus, I have a few other ideas I have thought up.  I'm tired of having to capture the 'hanger' with a dark trooper so I can get my AT-ST; I also want more than one AT-ST at Mos Eisley to see how much damage both of those futuristic armored vehicles (or more) can cause.