Old installation (upgrade or migration to latest release)

[anon30676603]

are those major version still available? Briefly look for previous version of Owncloud, but only found latest update file

There is a note about this in the official upgrading documentation:

https://doc.owncloud.org/server/9.1/admin_manual/maintenance/manual_upgrade.html#previous-owncloud-releases

And the server is windows also...

That will be the main problem. oC dropped support for windows in oC 8.0.x:

Important: Windows support is/will be dropped

Starting with oC8 the windows support was dropped: https://doc.owncloud.org/server/8.0/admin_manual/release_notes.html#windows-server-not-supported Additional to this ownCloud 8.1 won't run at all as an "hard-fail" will be added: The official blogpost about the dropped windows support is available here: https://owncloud.org/blog/owncloud-server-8-1-will-not-support-windows-as-server-platform-natively/

the last available version for windows is oC7 which unfortunately reached end-of-life some months ago:

END of life for OC 7, please upgrade ASAP

Version 7.0.15 is the last release of the OC 7.0-branch, there won't be any updates: https://owncloud.org/changelog/#latest7 You should upgrade to a newer version as soon as possible. Starting with owncloud 8.0, you will need php 5.4 and Windows is no longer supported (https://forum.owncloud.org/viewtopic.php?f=31&t=27449). Starting from 8.0, the numbering of major versions has change, so 8.0, 8.1, and 8.2 are all major versions that you must not skip during an upgrade. Before an upgrade, pl…