Download the latest Chrome file.
Move the file from your Downloads folder to somewhere safe on your computer.
Right-Click the file and press extract all (or extract using other programs if you use
them).
Go to chrome://extensions.
On the Chrome Extensions page, press the switch next to 'Developer mode', then press
'Load unpacked'.
Select the folder you extracted it to (called 'Schoolbox Dark Mode v23.1.0'), it should
look blank in this dialog.
You should now see the Schoolbox Dark Mode extension in the list.
Press the switch next to 'Developer mode' again, and use Schoolbox like normal.
Schoolbox Dark Mode is now installed!
If You Already Had Schoolbox Dark Mode (Update Instructions):
Go to chrome://extensions.
On the Chrome Extensions page, under the 'Schoolbox Dark Mode' section, press
'Remove'.
Now, follow the installation instructions above (or use the video).