2018 online is closed to get ready for next year 2019 program. 2018 is now the prior year. So you have to download your .tax2018 file and install the Desktop program to open it to finish it or to Amend it. But you might not be able to download the .tax file while they are transitioning over to 2019. If you can't get it now you will have to wait until December when 2019 opens and they have all the 2018 files moved over to the past year.
