Upgrading to 2019.2.15f1 errors

After upgrading a fully working project to 2019.2.15f1 I get these empty console errors

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All my scenes are black and nothing is rendered

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Most of the script cannot be loaded (both unity scripts and mine)

Restarting/reimporting all doesn’t work as usual.
Trying to reimport for different platforms doesn’t make a difference.
Do I need to create a new project and move all the assets there or is there a fix for that?

For what it’s worth, when things are so fucked up, yes, you need to create an empty project, install the plugins first and then export/import the assets specific to your project.
You’ll probably lose some preferences, will to go back to find the config files for each plugin if possible (not a given at all), fetch some screen resolutions for Game tab, etc.
Go step by step when you approach the phase when you have to import the assets you created. Probably make an archive of your project folder after each main import. Try to divide your assets into several packs too.
There will probably be several error warnings too, perhaps tons of them, but they may go once you’ve finalized your “migration”.

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thanks that helps

This is an issue of the new version of Unity Hub i suppose?, found a solution here: Blank Console Error on Empty Project with a Single C# Script - Questions & Answers - Unity Discussions