The install files will save themselves in your Downloads area. Find them then;

1. Ensure PowerPoint is shut down

2. If you have an existing version of empower slides for Mac you don't have to uninstall previous versions (if you experience problems installing then we recommend you uninstall). If you previously enabled Rosetta to install empower you must remove it from PowerPoint AND empower

3. Double click on the downloaded file to open it

4. Double-click the pkg to run the installer and follow the onscreen prompts

5. After installation has completed, the sync will run automatically. It will notify you when it is complete. You can continue to use PowerPoint during the syncing process.  If this is your first time installing empower the sync can take 10-15 minutes to complete