thanks for your response,
Yes, we have DependencyInjectionSectionHandler registered for using additional library which references v3.5 runtime library. This is part of legacy code.
1) can i use both version of llblgen pro v3.5 and **llblgen pro v4.0 ** in the same web application. Our existing code use v3.5 and we are adding new functionality using v4.0.
2) We started using v4.0 for the new functionality as v4.0 is available on your website. If v3.5 and v4.0 cannot be used together then can i get trail version of llblgen pro v3.5.
3) If i have to use v3.5 then how do i get licence for llblgen pro v3.5.