The minimum supported versions are Premiere Pro 12 (2018) and After Effects 15 (2018).
Installing the Adobe extension
Open the Adobe Exchange page or search for "Frame.io" in the Creative Cloud Marketplace, sign into the same Adobe CC account that you're using with Premiere Pro or After Effects, and then install the extension.
NOTE: Close and restart all Adobe applications. If this is not done, you will not see the Frame.io extension. If you still do not see the extension (see image below), you may need to restart your computer.
Alternative Installation Instructions
If you're unable to install the extension with your Adobe ID or you are having trouble acquiring it, please read these instructions for the alternative installation:
Opening the Extension
To access the extension, click on the Window menu item, then select Extensions > Frame.io. By default, the extension panel will float over the Adobe application. To dock the panel within a workspace, click and drag the panel via the panel name (Frame.io).
After making this change, save your Workspace:
Window > Workspaces > Save Changes to this Workplace or Save as New Workplace if you want to create a separate Frame.io specific workplace. The next time you open Premiere, if you still do not see Frame.io, click Window > Workspaces > Reset to Saved Layout.