Hey Oliver,
local copies of the javascript files will get you started. But you'll get bitten by the update mechanism in BrowserPlus.
BrowserPlus every 24 hours will pull down a small signed permissions bundle, that contains a list of services and platform versions that have been "blacklisted". Services get blacklisted when we detect a security flaw in them. Without an updated bundle, browserplus will refuse to run. The bundle is nothing more than a json file on disk.
There is a simple workaround, which is a tad hacky.
find the bpstate.json file on your disk and open it in your favorite text editor. find the
PermissionsManager::kLastCheckTSKey
key, and change the value to some date in the future. I think this is all you'd need to do to hack away on your cruise. please share your experiences.
very best,
lloyd