High Sierra download

I am needing to download DTOP for a Mac High Sierra. Found so much change that I was unsure what I should be do. Can you give me the correct URL. I intend to avoid upgrading my Mac further than High Sierra. I have DTOP.

I intend to avoid upgrading my Mac further than High Sierra.

Why is that?

PS: DEVONthink 2.x can be downloaded here: https://www.devontechnologies.com/support/download/legacy