I'm sorry about the issue. You don't have to update by tomorrow; you can update any time (if your kindle is not already updated automatically), but if your kindle version is not updated, then it will not be able to download books. But as long as your Kindle tablet is connected to your Wi-Fi / wireless network name, then it is already updated. To check, please click on the Amazon website below:
, then there, select your kindle model, and follow the steps there to check if your kindle has the latest software version
; if no, then follow the instructions there in order to update your kindle.
Please reply at the box below to continue. Thank you.
If there is still any issue, please let me know the model and/or serial number of your kindle.
When you are available, please type at the box below, then click on the Send button below to communicate with me, so I can help further. Thank you.