I don't know which pdf converting control and platform you were using, so can you provide more details?
Or I just search two related resources, you can have a test.
PDF converter with C#
PDF converting in vb.net
Hope it will be helpful.
Can you not just re-install the software? [if you have it saved]
What about upgrading to the latest version of Solid Edge, compatible with your operating system??
[32bit Windows = ST6 / 64bit Windows = ST7 onward]
Sean CresswellDesign Manager Streetscape LtdSolid Edge ST10 [MP3] Classic [x2 seats]Windows 10 - Quadro P2000