Hi Rodrigo,
One tip I could give: if you have two application servers you could upgrade another one 1st and see if the services are working fine. Or if you wish to replace old machines then add 3rd application server, ensure that everything works fine on that server and then you are ready to remove old server from the model.
In general this is not a big change from CCtr perspective but you should always prepare for surprises. The prerequisites are the same and if you do pure upgrade I'm not seeing potential issues. New installation would cause more issues as there is no prerequisites installed.
Br,
Jukka
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