The updater's “Install” button works only on CotEditor 3.3.0 and later.
To update from an earlier version, download archive from coteditor.com/archives and install it manually.

What's New on CotEditor 3.4.1

release: 2018-05-28

Improvements

Copy also the executability from the file permission of the original document when duplicating a document.
trivial Improve drawing of capsules for variables in the insertion format setting field.
trivial: Adjust preferences panes layout.

Fixes

Fix an issue under OS X 10.11 where the application could crash when an item in the outline inspector is clicked.
Fix an issue where the word completion of which word starts with double underscores (e.g. __init__) skipped the second underscores.
Fix an issue where the application could rarely crash while typing.
AppStore ver.: Fix an issue where the options for the software updater for non AppStore versions were wrongly displayed in the General preferences pane.

previous release notes