There doesn't seem to be any trial version to download from the
website. You may be to find a user who can export the DWG for you. At $995 it's a bit much for a single use unless it's a big project.
Assuming you have hard copies, it may be easier and even better to just scan those and trace over them in ArchiCAD. That way you aren't subject to possible drafting/modeling errors due to snapping to dodgy points in the DWG. It is not uncommon for 2D drafters to get their drawings good enough for print but not accurate enough for modeling.