You will get only purchase a recipe, the theme remains the same but by obtaining a license you have no rights to remove footer credits from the theme
Regarding your second message - most probably you are uploading HTML template into the WordPress, it will not work because its impossible to make HTML templates work in WordPress
Thanks for the follow-up.
The license you purchases authorises you to remove the credits link in the theme, that why the “remove backlink” button the page.
Kindly allow me to confirm that the license does not mean that you are buying the products, you are actually buying the rights,
Colorlib Support Team