RTAS was discontinued by Avid some years back and is no longer supported by Exponential Audio. There will be no further support for RTAS versions of Exponential Audio plugins, although the other formats (AAX, VST, AU, VST3) will continue to receive periodic updates and fixes. Remember that your license entitles you to all of the other formats. You may find installers for the other plugin formats at the regular download page.
Downloads of the old RTAS installers are not available from this page any longer. If you are an existing customer and you have lost your RTAS installers, please contact Exponential Audio at the support link. RTAS will no longer be provided to new customers. It's really time to say goodbye to RTAS.