If you find that after updating to Windows 10 that you are unable to save as PDF, you can fix it by first ensuring the software is up to date by checking for Design updates:
Click the Windows Logo in bottom left corner
Click All Apps
Scroll down and click on DynaScape
Click on Check for DynaScape Design Updates and follow the prompts.
If an update was available and installed, you can now try to create a PDF by going to File>Save as>Adobe PDF.