As we all know, a PDF is a standard format to exchange documents.
If you need to generate a PDF file from KG-Chart, please try this way.
1. Install "PDF print driver"
There are many software that act like a "printer", but actually generate a PDF file instead of printing it.
One of the popular software of that kind is CutePDF
They provide a free version called CutePDF Writer
Just to make sure to download two files: Free Converter (GPLGS) and PDF writer
2. Use "CutePDF" when printing
Once you have install the CutePDF, you should be able to select the "CutePDF Writer" as a printer.
So, just select it and print.
When you click on "Print" button, you will be asked where you want to save the file.
Choose a folder and name the file appropriately.
(A default file name will be "KG-Chart.pdf", so change it as you wish.)
Any application can use this method to generate a PDF file.