The keyword implies you are looking for a free copy of this file. Here is the absolute truth you need to understand:
Go to Waves.com and sign up. You do not need to buy anything immediately.
After installation, navigate to your VST3 folder. You will see waveshell1vst3_100x64.vst3 (or a newer version like WaveShell1-VST3 14.0_x64.vst3).
You will find many websites offering a direct download of waveshell1vst3_100x64.vst3 as a “free crack.” Do not use these. Reasons:
Bottom line: There is no legitimate permanent free standalone download of just the .vst3 file. You must get it through Waves Central.
Waves offers 50% off for students and educators. Combined with a "Buy 2 Get 1 Free" sale, you can get 3 high-end plugins (e.g., CLA-76, R-Bass, H-Delay) for under $50 total. This is a one-time payment—no subscription.