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Picasa has been retired and it was changed into Google Photos.
Unfortunately, there isn't an easy method like there was in Picasa where you can upload the pictures directly to Walgreens. The only way to upload the pictures from Google Photos is to download all of the pictures then upload them using the Walgreen website or you can download the pictures then put them on a CD or flash drive and take them into Walgreens.
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Okay, thank you for the update.