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Required Transport Layer Security is Disabled – Keep in mind that if you are seeing this error while attempting to install a legacy plugin, chances you are missing a key transport layer security feature required by the plugin.In this case, you can attempt to install the plugin via the Plugin Manager module inside Notepad++. The plugin cannot be installed conventionally – If you’re attempting to install a plugin via an external managed, chances are it’s failing because it’s not compatible with sideloading.As it’s been confirmed by a lot of affected users, you can resolve this problem by forcing admin access to the launcher. Missing admin privileges – One of the most common situations that will spawn this issue with Notepad++ is a situation in which the application doesn’t have enough privileges to allow the modifications of existing files.
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