Although audacity supports most of the VST plug-ins available out there, it doesn't support VSTi or VST instruments plugins. These include effects such as synth, guitar and so on. Audacity also does not support real-time effects or effects that can change the audio data simultaneously as they are being played. Oz 16 May 2019 at 15 h 38 min. Actually, 32-bit dlls DO work on 64. It depends on the VST Host. DAWs like Reaper does very well at supporting both 32 and 64bit VST’s. Also, a side note: Please consider addressing people with respect.
To add a new VST effect most easily on Windows, put its DLL file into the 'Plug-Ins' folder where you have Audacity installed. On Mac, the easiest folder to put the plug-in's VST file in is /Library/Application Support/audacity/Plug-Ins. 7.) Dead Duck Free Effects Bundle (25 VST audio effect plugins) This is a bundled effect plugin by Dead duck. It contains 25 original VST audio effect plugins covering everything from essential mixing tools such as EQ, compression, and limiting to creative sound-shaping tools such as delays, modulation effects, and reverb. Plug-ins Support for LADSPA, LV2, Nyquist, VST and Audio Unit effect plug-ins. Effects written in the Nyquist programming language can be easily modified in a text editor – or you can even write your own plug-in. Experimental Modules that extend the functionality of Audacity. Audacity can load VST effects (but not VST instruments) on all operating systems. The VST Enabler is no longer required. Install the VST effects to the Audacity Plug-Ins folder on Windows, to /Library/Application Support/audacity/Plug-Ins on OS X/macOS or to system locations.

To download all of these plug-ins in one go, visit the packages page.
Don't miss the extra plug-ins hidden on the beta page.
Effects
GChorus - Chorus effect.
GComp - Compressor.
GDelay - Delay effect.
GFader - Signal gain (-100 to 0 dB).
GGate - Gate.
GHi - High-pass filter.
GLFO - Triple LFO effect.

GMonoBass - Bass stereo imaging effect.
GNormal - Noise generator to avoid denormal issues.
Vst Effects Plugins Audacity Plugin
GSnap - Pitch-correction.
Instruments
GSinth - Mono synth using three continuous portamento sine generators.
GSinth2 - Extends GSinth by adding triangle, square and saw-tooth wave shapes.
Others
Packages - Packaged downloads.
Betas - Beta-release plug-ins.
Audacity is a free, easy-to-use and multilingual audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems.
Audacity can record live audio through a microphone or mixer, or digitize recordings from cassette tapes, vinyl records, or minidiscs. With some sound cards, it can also capture streaming audio.
- Record from microphone, line input, or other sources.
- Dub over existing tracks to create multi-track recordings.
- Record up to 16 channels at once (requires multi-channel hardware).
- Level meters can monitor volume levels before, during, and after recording.
Import sound files, edit them, and combine them with other files or new recordings. Export your recordings in several common file formats.
- Import and export WAV, AIFF, AU, and Ogg Vorbis files.
- Import MPEG audio (including MP2 and MP3 files) with libmad.
- Export MP3s with the optional LAME encoder library.
- Create WAV or AIFF files suitable for burning to CD.
- Import and export all file formats supported by libsndfile.
- Open raw (headerless) audio files using the “Import Raw” command.