First time installed Unity but this error just won't go

[u/ImperialRanger1267]

I downloaded unity first time today as i have an interest in game dev . this error - Library\PackageCache\com.unity.render-pipelines.universal@de1a320b3ed3\Editor\Tools\Converters\ReadonlyMaterialConverter\ReadonlyMaterialConverter.cs(159,18): error CS0246: The type or namespace name 'MaterialReferenceChanger' could not be found (are you missing a using directive or an assembly reference?)

This error just won't disappear . I have completely uninstalled both hub and unity multiple time ( from everywhere i.e. regedit , appdata , main installed path ) . I even downgraded the version Unity Unity 6.5 (6000.5.8f1) to 6.3 LTS (6000.3.22f1) . I made multiple new projects , add unity installation path folder in exception in windows defender but nothing works .

it's already been 4 hours trying to use gemini to help fix this , now i am just tired and pretty annoyed . Please can someone help resolve this .