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unable to install ad ons

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Every add on i try to install says cannot install plug in because engine with the same name already exists.

Every add on i try to install says cannot install plug in because engine with the same name already exists.

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Hi equinones86, Thank you for your question, I understand that when you try to install a plugin that it already exists. To make sure that this is not true, please visit about:apps in a new url.