Thanks for your post. By default we enable anti-aliasing for the application, so you may find the text is somehow vague. You can try to disable it with the following steps and see if you feel better:
open VPSuite/bin folder
copy the name of launcher e.g. Visual Paradigm for UML 6.3 (do not copy the file extension)
create a blank new file with .vmoptions as extension inside the VPSuite/bin folder (e.g. Visual Paradigm for UML 6.3.vmoptions)
open the file, paste “-Dswing.aatext=true” in it and save
double-click on the launcher to run the application.
I hope this make things better. If there is any further inquiry, please do not hesitate to contact me.