We have released InDesign 2020.0.1 with a lot of stability fixes. We recommend you to upgrade to latest version (if you’re not already on it) as it is more robust.
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Adobe InDesign TeamSteven commented
Hey guys I am having this exact same problem on InDesign since my school uses creative cloud 2018 the newest version. I downsaved to CS4 or later because I wanted to open it at home since I have the older version and not even that worked.... I had lots of information on that file and I can't manage to open it in any way what can I do to convert the file if it can't be opened? is there a solution to salvaging it since the file is actually there....?