Can I send an ad or email link straight to version B? (Essential CRO Split AB Testing app)

No. There's no separate link that always opens version B.

The app chooses the version for each visitor at random, based on your traffic split, and saves that choice in their browser. If someone opens a version B URL but was assigned to A, the app sends them to version A, and the other way round.

So you can't run "ad A → version A, ad B → version B" with the app. Use your normal URL in all ads and let the app split the traffic. See AB Test Planning Guide for tips on setting up a clean test.