When RabbitMQ has already been installed, changing the RabbitMQ storage installation parameters in the installer/updater script will have no effect. To change the storage, you need to perform the following actions:
Stop the RabbitMQ Service
Move the existing RabbitMQ folder to the new location
Often Located under the user that installed RabbitMQ’s AppData\Roaming folder, eg: C:\Users\DigiAdmin\AppData\Roaming\RabbitMQ
Change the System Environment variable
RABBITMQ_BASE to point to the new location
Restart the Server