updates feed: https://xyrio.github.io/RSSOwlnix-site/updates.rss
changelog: https://github.com/Xyrio/RSSOwlnix/blob/master/CHANGELOG.md

installing addons and translation: https://github.com/Xyrio/RSSOwlnix/wiki/How-To-Install-Addons-or-Translations

moving old data over

previous versions: @user.home/.rssowl2 or @user.home/.rssowl2-beta
copy stuff over to @user.home/.rssowlnix-beta
(you can start rssowlnix first to have it create the folder, then empty it and copy stuff over)
on windows @user.home is same as %userprofile% which can by typed in explorer addressbar.
more help: #89

mac

after unzipping you may need to remove extended attributes on mac:
xattr -c RSSOwlnix.app
and/or set executable flag (for current or all users)
for current user:
chmod +x RSSOwlnix.app/Contents/MacOS/RSSOwlnix
for all users:
chmod a+x RSSOwlnix.app/Contents/MacOS/RSSOwlnix
see #4