I wanted to look at the Sample Block here (https://documentation.concrete5.org/developers/working-with-blocks/creating-a-new-block-type/getting-started/sample-block-hello-world) to develop my own custom block later on, but when I tried to install it, it says "Unknown Package v.0.0 Broken package (handle directory)."

Additionally, the tooltip on the Add Functionality page when I try to click the button says "This package is corrupted. Make sure it has a valid controller.php file and that it has been updated for concrete5.7 and later." -- however, I'm not sure this is relevant as this block was created for 5.7 and is in the 5.7 docs, and was not changed at all.

There are no server issues as I've been able install other packages perfectly fine, so it's definitely related to this block. I've not made any changes to the block (literally downloaded from that page and uploaded to packages). Any guidance would be great.

EDIT: Welp, my bad. It didn't specify that the block had to be added from Stacks & Blocks > Block Types. Might be good to add that to the docs.