Platesolve3.80 catalogs are included in the zip file. They must be installed before platesolving. Run Platesolve3.80 then go to the File menu and click on Configure Directory... For the UCAC4 catalog select the Kepler directory and for the GaiaDR2 catalog select the UD Catalog directory. Close the application.

Platesolve3.80 can be executed from the command line. The command line parameters are:

FileName -- the full file name of the image to be platesolved
RA	 -- the estimated RA of the center of the image, in radians
Dec	 -- the estimated Dec of the center of the image, in radians
Xsize	 -- the estimated width of the image, in radians
Ysize	 -- the estimatesd height of the image, in radians

The call syntax is:
platesolve3.80 Filename RA Dec Xsize Ysize

Here's an example of a call:
platesolve3.80 "C:\Users\13108\Documents\PlateSolve3\Platesolve3.80\M45-0004B.fit" 0.9905 0.423 0.214 0.214

The platesolve results are placed in the same folder as the image. It will have the same name as the image file with new extention, .txt. The output file is organized as follows:
Platesolve_was_successful       	 -- True or False
RA,Dec			   		 -- RA (J2000) in radians, Dec (J2000) in radians
Imscale,Rot		   		 -- image scale in pixels/radian, Rotation angle in degrees from North.
Match_Method		   		 -- method used to match the image (string)
A,B,C,D,Alpha,Beta,Theta,Gamma  	 -- these output parameters define the geometric transformation of the image to the tangent plane of the celestial sphere centered on RA,Dec.
U0,V0					 --
MagOffset,WRMS,AveBG,NumPlate,NumMatched --

I've included a fits image with Platesolve3.80 called M45-0004B.fit that can be called with the above parameters. You should change the image directory to conform with its location on your machine.

platesolve3.80 "C:\Users\13108\Documents\PlateSolve3\Platesolve3.80\M45-0004B.fit" 0.9905 0.423 0.214 0.214