Unity 2018.1.5f: create invalid project

I saw that unity had some new update and decided to download it for its new features. The problem is that each time I create a new project, unity loads and then gives me this:

If I press "Retry", it puts me back on the Project selection screen. If I press "Quit", it turns off unity. If I press "Continue" it continues loading and it finally opens up unity. In the editor there is this constant error:

All component and all asset also have this under them:

When I try to turn on play mode this happens:

I searched the "CHANGELOG.md" file and found this:

I really don't know what to do so could someone help me.

 

yes,
I can create a new file in the folder

 

No, I can't edit the changelog.md file and I don't know how to make the file not read-only.

 

After turning all the files back to read and write and created a new project, the unity editor opened and it gave an error saying that ...Unity\cache\packages\packages.unity.com\com.unity.package-manager-ui@1.8.8\Editor\Sources\External\ SemVersion.cs had a "/*" at the beginning of the file but no "*/" at the end of the file. I simply added one at the end of the file. When I finished my edits, another error appeared saying:
.../Unity/cache/packages/packages.unity.com/com.unity.package-manager-ui@1.8.8/Editor/Sources/Services/Packages/PackageListExtensions.cs(8,35): error CS0246: The type or namespace name `Package' could not be found. Are you missing an assembly reference?
I checked the ... Packages/PackagelistExtension and everything seemed normal thought.

 

Thank, you everything works now.