When installing RX, there can only be one edition available at any time (Elements, Standard or Advanced). Please note that current editions of RX don't offer standalone versions for the Elements suite. Therefore, the following only applies to RX Standard & Advanced.
If you wish to trial or switch your RX standalone to another edition you can follow the steps below:
1. Make sure the intended edition has already been installed to ensure necessary resources exist, you can do this from your iZotope account or Product Portal.
2. Open the RX standalone application.
3. Open RX Preferences > Licenses & Updates > Remove Authorization (if available).
4. From the dropdown menu on this page, change the value to the desired edition.
5. Restart RX and you will be prompted to authorize again (click "Continue" to begin the trial).