I’m having a different set of difficulties on the same topic. While the update appears, an attempt to apply it leads to the following error: An error occurred while updating StartupPro: The package could not be installed. The package contains no files.
While this explains why there are currently problems, it’s actually not quite fixed yet (as stated) and we’ve emailed the developers with a heads up about the remaining issues.
In the meantime, if you’d like, we can manually email you the latest theme versions for you to upgrade manually. Or wait another 1-2 days for all the kinks to be worked out and you should be able to upgrade automatically with ease.