I've finally succeed in installing OMSA on proxmox 6.x and in return for all the information i've found thanks to the community, i wanted to share my findings.
Here we go.
Be sure to be logged as root at all time : sudo su
First, be sure to remove omsa from Proxmox 5.4 before upgrading.
I'm trying to set up our cluster of 3 Dell R730's & I'm following the wiki here: https://pve.proxmox.com/wiki/High_Availability_Cluster_4.x#Dell_IDrac_.28module_.22ipmi_watchdog.22.29
I do have OMSA installed so I edited out dcwddy64.ini: