Due to recently rolled out changes by Instagram to their post promotion workflow, attempting to promote posts in Flume will display the error message:
"We've released an updated version of Instagram. Please update your app before promoting your post."
Attempts to support this new workflow in Flume are continuing, however due to technical difficulties, no guarantees can be provided for this feature in the future.
As a workaround, please use the official Instagram apps to promote your posts.