1. Genymotion Desktop 3.1 and below
Installing the OpenGApps from the widget is broken with Genymotion Desktop 3.1 and below. Please upgrade to Genymotion Desktop latest version.
2. SourceForge is temporarily unavailable
Since the opengapps package is downloaded from SourceForge, it may fail from time to time due to SourceForge low reliability.
If this happens even after upgrading Genymotion Desktop to the latest version, just try again until it works.
If for some reason the above did not work for you, you can try to install the Open GAPPs manually. See How to install the Open GAPPs package manually?
Since opengapps.org update their package regularily, we cannot test nor guarantee the result when using the latest Open GAPPs. Hence, this method should only be used as last resort. Use at your own risks!