I am outsourcing this as I do not have the time at the moment to devote to this project.
I will provide the source code to the winning bidder without the captcha solver dll. You will need to run the app in debug mode running a single thread and set the captcha answer manually to test.
Once the code is fixed I shall uncomment the code that uses the captcha solver.
So basically all you need is to fix the code to make it work again.