Update from OpenNebula 1.4


I inherited a cloud of virtual machines running OpenNebula 1.4 and I am considering to update to the recent version. However I found that only the update from 2.0 or newer to recent is oficially supported and for an update from 1.4 to 2.x I found the following discussion: https://www.mail-archive.com/users@lists.opennebula.org/msg08728.html

In this discussion there is a link to a support ticket where scripts for an update 1.4 -> 2.0 are given. However this link is dead now.

Can anybody give me these scripts or is there some guide on how to update from 1.4 to recent?

Many thanks in advance!