Error installing apps and extensions from Chrome Web Store
I kept getting stuck on "checking" while trying to install extensions. Poking around I found the download directory was set to "F:/Driver" for some reason. That path doesn't exist on my system. I set it to a valid directory, and it started working.
If the web store is giving you errors, you can directly download apps/extensions by copying the app ID and going to this link:
https://clients2.google.com/service/update2/crx?response=redirect&x=id%3D~~~~%26uc
You will want to replace "~~~~" with the app ID. You can find the app ID in the URL bar of the app on the Chrome Web Store. It will look like a random string of letters between a slash and a question mark.
If you do this, it will directly download the file. You can go to your extensions page and drag it on and it may install.
If it still doesn't install, change the file extension to ".zip" and extract it into a new folder and delete the zip file. Then go to your Extensions page, click "Developer mode", and click "Load unpacked extension" and click the folder you extracted it into.
This is how I install things if the Chrome Web Store isn't responding. You can also view the source code of the app like this.