Hello! You should take a look at these instructions.
And this from the Library homepage…
VCV Library Instructions
Download and install VCV Rack. Register for a VCV account and log in using Rack’s “Library” menu. Subscribe to a plugin, relaunch Rack, and click “Library > Update all” in the menu bar. Adding individual modules will be allowed when Rack v2 is released, since this relies on its module whitelist feature. Until then, you must subscribe to the entire plugin. Restart Rack and add the new module(s) to your patch.All plugins on the VCV Library are available for Windows, Mac, and Linux. The “major” version (i.e. vMAJOR.MINOR.REVISION) must match between Rack and its plugins. For example, Rack v1.* can only load v1.* plugins.