You said "--after manually downloading bass.dll.." MusicBee always contains bass.dll by default. If you installed 3.3x, it contains bass.dll ver. 2.4.14.0, which is already what you want. It also contains basswma.dll by default, but an older version than the 2.4.5.9 one I pointed you to at the un4seen site. Ideally the install sequence should be first .NET, then the MusicBee 3.3 incremental update applied to your existing 3.2 installation, then overwrite the existing basswma.dll in the MusicBee folder with the newer one.