We maintain Matomo (Piwik) by fixing bugs in new releases, e.g. 2.5.0, 2.6.0, 2.6.1, 2.7.0. We do not support older versions of Matomo nor do we provide patches for older versions of Matomo. Please keep your Matomo updated to the latest version to get security updates and new features.
Each newly released version includes many bug fixes and improvements (sometimes even security improvements!). When you use a Matomo version other than the latest stable version and request our help (for example in the forums or paid support), first make sure you upgrade to the latest stable version.