OwlPlug store has been deprecated since 2+ years. As described in #275, support will be removed from OwlPlug.

Some external plugins source with kind: store described here won't work anymore : https://github.com/DropSnorz/OwlPlug/wiki/Remote-plugin-sources

References to the store in the wiki and README must be removed.