In recent days we have released the 10th preview of OMNeT++ 6. It has important fixes for the Windows toolchain. Additionally, preview 10 is required if you want to build the latest versions of INET. Go ahead and
download it.
Additionally, we have released a new version from both the INET 3.x branch (3.7) and the INET 4.2 branch (4.2.2). These are mandatory, if you want to use OMNeT++ 6.