Never mind... I got .NET Micro Framework 4.2 back in Target Framework drop down list by running 'repair' from windows installed programs.
Some detail: All folders in 'Program files (x86)/Microsoft .NET Micro Framework/v4.2' were empty. I think I messed up the installation sequence installing NETMF4.3 over NETMF4.2 and than romoving NETMF4.2.