There are no ACID loops in MM! There are Instruments and Soundpools, including in the Free and Trial versions.
So, did you download and install any additional content that is available? Assuming you are trialling the new 64 bit version, did you check what is shown for you on the Downloads tab, top right corner of the workscreen?
Can you clarify which program you are using - you have posted in the Acid Music Studio forum, however mentioned Music Maker - these are 2 different programs.