The problem wasn't due to a difference in time zone or date and time of my pc, but to the fact that I didn't upload the book with ADE before the file duration of .acsm file was over.So after trying many times, with no result, to adeguate my pc date and time to the one of the .acsm file, I cancelled all .acsm files I re-downloaded during the several attemps, I downloaded it again from the link of my book purchase and instead of saving to my computer the file I opened it directly in my browser Google Chrome and loaded it into ADE, successfully!!
I hope this could be useful for next ADE users with the same problems.
Patrizia Galletti
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