Hello everyone, I would like you to help me with something. Because the waves flow motion synth was installed in effects and not in synths. I use Fl Studio
To load any Waves Instrument please make sure to create a Stereo Instrument track.
The fact you mentioned you can see Flow motion in effects means it is installed and the license is activated.
I believe a hard rescan as per these next steps might do the trick.
If its still a no go, after following the mentioned instructions, please Contact Technical Support directly and they will gladly assist.