How to upgrade ABB freelance DCS from Version 6.2 to Version 2019

Hi all,
As title, I want to ask how to upgrade ABB freelance DCS from Version 6.2 to Version 2019.
I have 1 Engineering PC, 3 Operation PCs, 3 PLCs.
Can I reuse existing hardware - AC800F with S800 I/O system?
And What software will have to buy?
Any help about this issue?

Thanks,
Kha Adu
 
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