Unable to update Unity version

Hello,

I am trying to update Unity from "2018.2.0x-ImprovedPrefabs" to "2018.3b" but I get the same error every time I try to open a project.

Screenshot: (https://gyazo.com/df3a72f003caa73969ccabcd35e536b0)

Thank you

 

"2018.2.0x-ImprovedPrefabs" was probably some of those preview builds?

i'd try exporting the project as an unity package from that version.. and import to new project in 2018.3b,
or, delete your ProjectSettings/ProjectVersion.txt file that contains the "2018.2.0x-ImprovedPrefabs" text. *keep backup though

 

Thank you so much, I just deleted that file and got it working.