Navigate to your computer's hard drive (most likely C: drive) > Acuthin > RMPDF > Preferences. A box will pop up where you will need to verify 2 items:
Output options is checked to "Use default folder location" - and the default folder must be a valid folder on your PC
Check the box marked "Use print job name to save PDF file under default folder automatically"
Once you've verified the above items, click OK. You should no longer be prompted to "Save As", and the PDF prints will be stored under the default folder automatically.
Note: If at any time the default folder is deleted from your PC, you'll be prompted to "Save As" until a valid folder is added to your PC and to the location path in RMPDF preferences.