YOU DON'T HAVE TO !!
vst3shell_v1.2.1.zip
vst3shell_beta.zip
Extract the folder to anywhere outside of your VST2 folder.
Add vsti3shell.x64.dll to your VSTi list.
Add vst3shell.x64.dll to your VSTFX list.

When you choose them you will get a list of your vst3's, pick one from the list.