Bumping an old thread to update my link to dropbox,
here is the .iso of the ES-E1 software. At some point in the past couple years google drive got updated and I've been having to approve each request to see the file (a few a month), hopefully this fixes that issue. The previous drive link will remain active just in case, but the dropbox link should be more reliable.
For those who are finding the link, it's great there are so many people still using the 1v to it's potential! Hope you all decide to join photrio.