When Android shows the "Insufficient Storage Available" error
Lack of working space is the cause of the "Insufficient Storage Available" error which periodically bedevils Android users. Adding insult to injury, there are several possible causes for the lack of sufficient working storage.
Android apps use three sets of storage space: for the apps themselves, for the apps' data files, and for the apps' cache. Those caches can grow large, yet they are reported as free space by Android-though in fact that space is not available as a working space for app installation.
If you get the "Insufficient Storage Available" error, empty your app cache to see if that clears up enough working space for the installation. How to do so depends on what version of Android you are running, as well as from what device maker.