OK. Per the email, I went to my.sketchup.com and clicked “Launch” and it came up (with a “Whoa There” warning about not being optimized for touch screens), but it never asked me to sign in!
I’m assuming it picked up my Google or Forum login from my browser.
What I can’t find is any way to grab a model from either Trimble Connect or 3DWarehouse!
I’m at Basecamp, so if anyone from SketchUp wants to help me, please contact via Basecamp App!