The same instructions apply for both Essential & Pro versions of Regroover

Locate Regroover

After making sure Regroover is installed correctly, open a new instance of Reason.

Click on Edit > Preferences... in the top toolbar.

In preferences, click on the Advanced tab

Ensure the following path exists in VST Plugin Folders:

C:\Program Files\Steinberg\VstPlugins\

If it does not exist, add it and restart Reason.

Once Reason loads, in the Browser, click on Instruments

In the search field, type in 'Regroover' and click Search

Double-click on Regroover and a new instrument track will be automatically created for you:

How to open Regroover in Propellerhead Reason (Windows)