I had v4. My old PC OS crashed, but was able to just copy data from hard drive to new PC. Opted to upgrade during this transition to v7. Installed v7 on the new PC and logged in. Trying to get my old vault open in v7. When I try to open the old vault in the 1Password.agilekeychain folder, I get the error "1Password was unable to upgrade this vault. Check your password or contact Support". Is the vault password different form my master password? I have the old vault on other devices (an MS Surface and an iPad). I can still access there with the PW I tried to use to convert.
1Password Version: 7.2.617
Extension Version: 188.8.131.52
OS Version: Windows 10
Sync Type: Dropbox
Referrer: forum-search:error 1Password was unable to upgrade this vault. Upgrading from v4 to v7