If this is a one-time task (making the form fillable), you may be able to get away with just downloading the 30 day eval copy of Acrobat. Making a form fillable is not too complicated, and once you know your way around the form options in Acrobat, it should not take a long time to do so.
Acrobat actually has a feature that will try to recognize form fields and will then convert them to fillable form fields (this is not perfect, but it can save a lot of time).
You can find the eval copy here:
http://www.adobe.com/products/acrobat/Just put your mouse over one of the product links on the right half of the page, and popup menus will show up with a "Try" option. You want the Pro Extended version.