Plugin not working on Grafana 8

[KOCIU22]

Hello

After update new version of grafana 8.0.2 plugin stop working before on version 7.5 was ok

[baur]

custom.ini

[plugins]
allow_loading_unsigned_plugins = williamvenner-timepickerbuttons-panel

[KOCIU22]

Unfortunately this is not working for me still i get this