presets for various types of plugins are stored in different places on the disk.
For VST3 plugins, presets are stored in:
C:\Users[Your username]\Documents\VST3 Presets (Windows)
Documents/VST3 Presets (Mac)
For n-Track nEfx plugins, they are stored in:
C:\Users[Your username]\AppData\Roaming\n-Track Studio 9\BuiltInPreset
~/Library/Application Support/n-Track Studio 9/BuiltInPreset
For VST2 plugins n-Track asks to pick a file manually when you try to save or load the preset, so you can pick any folder you like.
If you copy the paths above to the new PC you should be able to reload the presets.