This is what it says on the Member page:
"Remember that the bonus blocks are moving around all the time, so you may need to check the shops more than once to find them all—a great reason to revisit your favorite shops!
From March 1-31st, the material list and assembly directions plus your February Hidden Meadow Sampler bonus block finds will be in your member area."
I've quit trying to download blocks as I find them and just wait until that month's hop is over and get the whole thing at once.