Just get a portable version (I use this one, it comes with an updater)
To swich it to english language, either delete the other language dlls in /Chrome/Locales or go through the Wrench/Optionen/Details/Web Content.
Since Chrome 8.x is only as a dev version available ATM. Just run the updater and click the DEV button
The checkbox is for version control so you don't update if there is no new version