As you're looking to install DNG profiles in Lightroom, could you please let us know the exact version of Lightroom you're working on?
Also, please try the steps below and let us know if it helps:
When you launch Lightroom for the first time after updating to the latest version, the existing profiles on your computer are automatically added. If you want to install new XRite or DNG Profile Creator profiles after the first launch, do the following:
Save the profiles from XRite or DNG Profile Creator to your desktop.Open Lightroom.
From the menu bar, choose File > Import Profiles & Presets.
In the Import dialog that appears, browse and select the profiles that you saved in Step 1.