If you purchased your copy of Accordance in the Mac App Store, there was a very important update released a few days ago that you need to download. Accordance v. 10.4.6 will prep your copy of Accordance for the imminent release of v. 11 in the Mac App Store.
Please update to 10.4.6 as soon as possible. We will make another announcement as soon as Accordance v. 11 is available through the Mac App Store.
If you have any questions, please let us know in the comments below.