I am trying to upgrade from civicrm 4.5.5. I follow instructions of https://docs.civicrm.org/sysadmin/en/latest/upgrade/drupal7/ but any time I do the upgrade I get the screen with skip or retry buttons that doesn't work. I don't know if the ugrade was completed.
Then if I go to the civicrm page I see the new version number (4.6.34) but menu disappeared and I can't continue working with the previous data, contribution pages, mailing, etc.
what could be the problem?