Microchip Studio: Support for new devices in Microchip Studio can be added by using the Device Pack Manager, which is found under Tools → Device Pack Manager.
For offline installers, go to packs.download.microchip.com/. To install a package, double click on the installer file and follow the instructions. Any open Microchip Studio window will have to be closed for the installation to take effect.
IAR™: Support for new devices in IAR Embedded Workbench can be added by installing the latest service pack. The service pack is available at My Pages on https://iar.com (MyPages is available for users with registered IAR™ licenses, using the same email address that was used to register the license).