Quassel IRC (Windows)

0.14.x clients are compatible to cores starting from 0.5.x and vice versa. Note, however, that you won’t get some features with an outdated core, and that you might get (a lot of) (harmless) warnings spammed on your console if you mix old and new versions.

The database schema and config file format are usually updated between minor releases (e.g. 0.13.1 -> 0.14.0). Database schema upgrades may take a long time, and also temporarily use more diskspace (this is especially the case when upgrading from an older version to a 0.14.x release, which brings some massive changes to the database). As always, we recommend making backups before starting your updated core or client for the first time. Also remember that downgrades to a previous minor release are not supported.
Between patch releases (e.g. 0.14.0 -> 0.14.1), we don’t usually change config file formats or the database schema, so downgrades within the same minor release should usually work.