I installed i18n through terminal but does not appear on installed plugins list

I’m using strapi 3.6 and I’m having a really bad time trying to setup Internationalization. For some reason when I try to install i18n through the marketplace the only thing it does is displaying an alert that says ‘An error occurred’, so I tried to install it through the terminal (npm run strapi install i18n) but still no luck. What am I doing wrong???
PS: idk if this is useful but, for some reason, strapi commands are not working at all despite the fact that strapi is installed.

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