I bought these tiles in 2015 and need more. Just so I'm clear, this note indicates that this won't work with my previous purchase, correct? "These tiles will not interlock with our Eco-Soft Tiles - 2015."

Any Eco-Soft tile bought before 2015 will interlock with our Eco-Soft + tiles, but will not be the same thickness. If you need further tiles to expand your flooring, please feel free to contact one our Flooring Heroes, and they will be more than happy to assist you with expanding your flooring.