WordPress 5.8 install

Hi there,

i now installed the plugin under WordPress 5.8 and when try to active it’s drop me to a 404 error with this link:

/wp-admin/plugins.php?_wpnonce=791d2252ef&action=activate&plugin=email-encoder-bundle/email-encoder-bundle.php

With bulk action successfully activated the plugin, but when i want to open the settings page, i get 404 error again, with this link:

/wp-admin/options-general.php?page=email-encoder-bundle-option-page

Any idea?

Thanks.