Hello,
Unfortunately, we are unable to complete your upgrade. The call to verify your license is failing, due to the same reason I outlined in ticket 873921.
Any cURL request that is made, using SSL, from the server is returning two sets of headers. As such, this is causing the license verification to fail. I have set up a test script here, which outlines the issue.
http://bmws1vc.alter...um/curltest.php
I would recommend contacting your host regarding this issue, as it appears to be a server side problem.
For now, however, I have restored the IP.Board 3.4.x files so the site is online again. Once this issue has been resolved, we can proceed with the upgrade.
Regards,
Ryan Ashbrook
Invision Power Services, Inc.