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when I attempt to add plugins, I get a message that says the plug in is not compatible with v8.0, is there a workaround for this?

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when attempting to install calendar plug in clock plug in, I am getting an error message that says not compatible with v8.0. even when I filter by versions compatible with v8.0 this message comes up.

when attempting to install calendar plug in clock plug in, I am getting an error message that says not compatible with v8.0. even when I filter by versions compatible with v8.0 this message comes up.

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Is that a plug-in or an extension, where are you installing it from (title, and url please).