Update application using COM interface from 1.7.x to 2.5.x

Hi, I’ve developed an application in VB.net which uses a lot of features available in the 1.7 version of COM interface, and also other features related to text manipulation and watermarking provided by the pdfforge.dll. After 2 years i’d like to update that application, i’ve read about new object’s and workflow to follow, but i can’t find text manipulation funtionalities in the new interfaces provided with the 2.5.x version of the software, are they still available?
Is still possible to call ghostscript direct through the com interface?