If you are having issues configuring Packages in Avalanche 6.X using Chrome it is likely due to the fact that as of Chrome Version 42, NPAPI is no longer supported by default.
Enabling NPAPI in Chrome Version 42 and later
As of Chrome Version 42, an additional configuration step is required to continue using NPAPI plugins.
In your URL bar, enter:
chrome://flags/#enable-npapi
Click the Enable link for the Enable NPAPI configuration option.
Click the Relaunch button that now appears at the bottom of the configuration page.