here is description of problem:
when i downloaded addons from addons.nvda-project.org to my computer and opened chosen addons, nvda made as usual. Then I restart nvda, but in Addon manager addon status was "install" and now I cannot use some of addons. These are: ControlUsageAssistant, FocusHighlight, Ocr, PlaceMarkers SystrayList and Wirtual revision.
What could be wrong?