NeedMicrodemHelp

Hello I'm new here I'm having a problem merging four USGS topo DEM quadrangles of San Francisco using MicroDEM (it appears Admin of this Vbulletin forum has disabled attachments so I can't upload error screenshot or post Imgur link until I'm a member for one day..) I keep getting error message my (free) install of MicroDEM missing some ".dbf" file, and then will only open window for "output merge" folder location, not open a 'select merge files' window to click on the 4 .dem files to merge them. I've tried uninstalling/re-installing MicroDEM multiple times to no avail getting same error/result. Anyone out there that has a properly working version of MicroDEM that has successfully merged DEM files (..or other DEM merging software that'll do the trick), and then save merged file as single ASCII XYZ file and email it to me? (not sure how big it would be - I have gmail file limit of 25 MB, but can also do cloud upload/download if need be). I need a single ASCII XYZ to supply a CNC model company so owner can open in AutoCAD and create 3D model for me for a project. Help is greatly appreciated thank you in advance!!! :D