I haven't been able to find a link to the any of the old browser .cia files other than from this video, where only what seems to be the 7.1 of the US version is uploaded.
That's the 7.1/EUR version of the internet browser, and I've been having the same problem trying to download the JAP version of the same file. From Prince's post it seems like the USA version is inaccessible as well.