I have tried everything I saw on how to install ProGrids in as many ways as I can think of. I have tried searching for it in the package manager with the pre-release packages setting on, and I have tried to use the com.unity.progrids method in the name and git URL options from the plus sign in the top left corner of the package manager, but none of them work.
Whenever I tried those methods, this error message came up:
[Package Manager Window] Cannot perform upm operation: Package name ‘ProGrids’ is invalid. [InvalidParameter].
Please help me. I am new to Unity and I am trying to use ProBuilder and I heard that ProGrids goes well with it.