VST don't appear on effects drop down list

VST problem

I loaded some new vst effects such as voxengo warmifier and nugen stereoizer installing them in the vstplugins folder but I can’t see them on the effects drop down list which contain some older vst ¿is there any limitation in size, or what is happening?

You may just need to have n-Track rescan the VST plugin folder path.
I’m still using 3.3 and the option for rescan is under Preferences > Paths.