WordPress 4.1 is released yesterday, and I have been testing all Dev4Press plugins to make sure everything is working with new WordPress. Currently, all Dev4Press Pro plugins are tested and working fine with WordPress 4.1.
Right now Dev4Press is also updated to WordPress 4.1, and so far we have an issue with our auto update service, so if you try to download update or install Dev4Press plugins through Dev4Press Updater plugin, that will most likely fail. I am looking into the issue with the updater service (this is problem on Dev4Press server, not with Updater plugin), and hopefully it will be resolved in the next few days.
Update: Auto update via Dev4Press Updater is now fixed. If you still have issues with this, please use the support forum to report the problem.