Packages for offline installation may be found at releases page:
- Download a zip file.
- Unpack it to a folder.
- Visit chrome://extensions, switch on developer mode.
- Press "Load unpacked" and point to the folder with unpacked extension.
If extension is installed this way (from file system, not from webstore) then it won't automatically update when new version is published to webstore. You have to update extension manually by reinstalling it from a new package from the releases page.
Please, donate to keep me motivated. Thank you!