There is a full change log for 15.1 here, and there is a link to 15.0 at the bottom of the page.
16.0 is going to come out next month, so if it will be an ordeal to update, you might want to wait for that version.
There is a full change log for 15.1 here, and there is a link to 15.0 at the bottom of the page.
16.0 is going to come out next month, so if it will be an ordeal to update, you might want to wait for that version.