You can run Redgate tools on side by side versions of SSMS on the same machine at the same time.
- Uninstall the Redgate tool(s)
- Install SSMS
- Reinstall the latest version of Redgate tool(s)
You can download the latest versions from the customer portal.
You will also need check that the tool version you're installing is supported by the versions of SSMS you are running. You can find the requirements pages on the Redgate documentation site.