Firstly, extract this .zip folder:
Click "OSU Cursor for Roblox":
This is what the cursor pack looks like, DO NOT RENAME THEM!:
In the search box, type "Roblox Player" then click "Open file location":
Right-click on "Roblox Player" and click "Open file location":
Click "content":
Click "textures":
Click "Cursors":
Click "KeyboardMouse":
You want to replace these with the ones from the pack:
Click "Replace the files in the destination":
Now your done!: