This is a Chrome extension that lives on your computer, not in the Chrome Web Store. You'll download a folder and point Chrome at it. The whole thing takes about five minutes.
Go to the releases page. You'll see a list of versions. Under the top one (the newest), look for the .zip file and click it to download.
Find the downloaded zip file (probably in your Downloads folder). Double-click it to unzip it. You'll get a folder called Dean Tools.
Drag that folder to your Desktop.
In Chrome, click the address bar at the top (where you'd type a web address). Type chrome://extensions and press Enter.
If Chrome searches Google for it instead, make sure you're typing in the address bar, not the search box.
Look in the top-right corner of the extensions page. You'll see a toggle labelled Developer mode. Click it to turn it on.
A row of buttons will appear at the top of the page.
This is safe and expected. Chrome requires this for extensions that aren't in the Web Store. It won't affect anything else in your browser.
Click the Load unpacked button (top-left, with the green border in the picture above).
A file browser will open. Navigate to your Desktop and select the Dean Tools folder. Click Select Folder (Windows) or Open (Mac).
Dean Tools will appear in your extensions list:
Open any case in Salesforce. You'll see a green U button in the bottom-right corner of the page. Click it to open Dean Tools.
If you don't see the button, try refreshing the Salesforce page.
When a new version is available, you'll see a yellow banner inside the extension. Here's what to do.
Go to the releases page and download the .zip file from the newest release, just like the first time.
Find the Dean Tools folder on your Desktop (where you put it during install). Delete the whole folder — just drag it to the trash.
If you installed an earlier version, the folder might be called something different (like ueu-dean-extension or chrome). Delete whatever folder Chrome was loading — you can check the path at chrome://extensions.
Double-click the zip you just downloaded. It'll create a new Dean Tools folder. Drag it to your Desktop — right where the old one was.
Same name, same place. Chrome will find it.
Go to chrome://extensions, find UEU Dean Tools, and click the reload button — the circular arrow icon.
That's it. The new version is running.
Try refreshing the Salesforce page (Ctrl+R or Cmd+R). If it still doesn't appear, go to chrome://extensions and make sure Dean Tools is toggled on (the toggle should be blue/green, not grey).
Go to chrome://extensions. Dean Tools will show an error. Click Remove to uninstall it, then follow the install steps again from the top.
Open Dean Tools on a case page (click the U), then click Feedback / request in the bottom of the panel. Describe what's happening and it'll open an email with diagnostic info attached.
Or email hlarsson@unity.edu directly.