Thanks a lot, after a re-upload I managed to get past the upgrade screen. Unfortunately I now see some database errors (I removed the table prefix for security reasons):
[SELECT A1.id, A1.form_id, A1.type, A1.label, A1.required, A1.private, A1.edit_mask, A1.name, A1.configuration, A1.sort, A1.hint, A1.created, A1.updated, A2.id, A2.type, A2.deletable, A2.title, A2.instructions, A2.notes, A2.created, A2.updated FROM form_field A1 LEFT JOIN form A2 ON (A1.form_id = A2.id) WHERE A1.form_id = 2 ORDER BY A1.sort ASC]
Unknown column 'A1.required' in 'field list'
[SELECT A1.id, A1.content_id, A1.isactive, A1.type, A1.name, A1.body, A1.lang, A1.notes, A1.created, A1.updated FROM content A1 WHERE A1.type = 'banner-staff' ORDER BY A1.name ASC]
Unknown column 'A1.content_id' in 'field list'
[SELECT A1.id, A1.form_id, A1.object_id, A1.object_type, A1.sort, A1.created, A1.updated, A2.id, A2.type, A2.deletable, A2.title, A2.instructions, A2.notes, A2.created, A2.updated FROM form_entry A1 LEFT JOIN form A2 ON (A1.form_id = A2.id) WHERE A1.object_type = 'C' ORDER BY A1.sort ASC]
Unknown column 'A2.deletable' in 'field list'
[SELECT A1.staff_id, A1.group_id, A1.dept_id, A1.role_id, A1.username, A1.firstname, A1.lastname, A1.passwd, A1.backend, A1.email, A1.phone, A1.phone_ext, A1.mobile, A1.signature, A1.lang, A1.timezone, A1.locale, A1.notes, A1.isactive, A1.isadmin, A1.isvisible, A1.onvacation, A1.assigned_only, A1.show_assigned_tickets, A1.change_passwd, A1.max_page_size, A1.auto_refresh_rate, A1.default_signature_type, A1.default_paper_size, A1.extra, A1.created, A1.lastlogin, A1.passwdreset, A1.updated, COUNT(DISTINCT A3.staff_id) AS teams_count, A2.id, A2.pid, A2.tpl_id, A2.sla_id, A2.email_id, A2.autoresp_email_id, A2.manager_id, A2.flags, A2.name, A2.signature, A2.ispublic, A2.group_membership, A2.ticket_auto_response, A2.message_auto_response, A2.path, A2.updated, A2.created FROM staff A1 JOIN department A2 ON (A1.dept_id = A2.id) LEFT JOIN team_member A3 ON (A1.staff_id = A3.staff_id) GROUP BY A1.staff_id ORDER BY A1.firstname ASC, A1.lastname ASC LIMIT 25]
Unknown column 'A1.group_id' in 'field list'
Is there any way to fix this without starting from scratch?
Many thanks in advance!