@Jeetender It looks like you didn't grab the source code for the Tube2 implementation. There's usually 3 things you need:
This Airwindows.h file, which is the main wrapper for all of the FX.
DspNetworks/ThirdParty/src/airwindows/AirWindows.h
The individual wrapper file (Tube2.h)
DspNetworks/ThirdParty/Tube2.h
And the source code for the individual FX (Tube2 subfolder)
DspNetworks/ThirdParty/src/airwindows/Tube2
*Note 1: I had issues compiling all of the FX simultaneously so I initially broke this library into 2, so Tube2 wasn't included in the original version. I just added it, checkout the dev branch specifically.
*Note 2: The individual source code for all of Airwindows FX are basically the same. There's typically 3 files:
Tube2.cpp
Tube2.h
Tube2Proc.cpp
Currently I accidentally pushed a version with a .inc extension. I'll try to fix those but you can manually remove those for now.