Drainage tabulation VBA error - Runtime error '48' Error in loading DLL

I am having trouble with FDOT SS10 Geopak Drainage, specifically generating storm sewer tabulations.  After filling in the information in the dialog box and clicking "Generate Storm Sewer Tabulation" I get this error:

Run-time error '48' - Error in loading DLL. 

I don't know what is wrong, since I recently did these storm sewer tabulations a couple weeks ago and had no issues.  I only am regenerating them since the tailwater changed.  Could there be an issue with a recent update my computer had?  I am currently running Excel 365 and Version 08.11.09.918 of Power GEOPAK V8i (SELECTseries 10), FDOT version.

Thanks in advance for any advice.