The Additional Unit Pack

[Jubal]

It should be compatible. What problems are you having?

[Konigstein]

Having issues setting up the shortcut maybe that's just my fault. Not sure which paths to use for the shortcut etc because it will end up telling me its invalid or doesn't exist

[Jubal]

Have you ever set up any other command-line mods with steam or is this the first time you've tried?

[Konigstein]

First time so far, haven't used any mods while i had the steam version of Rome

[Jubal]

http://forums.totalwar.org/vb/showthread.php?123528-Using-mods-with-Steam-RTW-including-BI-and-Alexander

Try this guide, if it doesn't work come back and we'll try and work something else out. 

[debux]

Steam is rather... complicated... to play mods with, to be honest. It should work if you right click on your "RTW gold" icon, select "Properties" and then "Set Launch Options" where you can type in the following (exclude the apostrophes): " -mod:AUP". It should work with that.

[Konigstein]

Tested for a while and havent had much luck, just steam errors, i'll definitely try that Debux thank you, and thanks to you also Jubal.

Edit: It has for sure worked thank you both so much and now i can enjoy these awesome units

[debux]

I'm thinking that the guide that Jubal posted is rather outdated... the Steam interface has changed a lot throughout the years. But good to see that it worked !

[Jubal]

Deebs, d'you think you could write an up to date guide to it?

[debux]

Sure, although it doesn't require that much of an effort I might as well make a post summarizing all the extras one can put in the Target path (like "-nm" and the such)