Upgrade Manage Engine from 9.2 (9238) to 9.4 (9414)

Upgrade Manage Engine from 9.2 (9238) to 9.4 (9414)

We need to upgrade our Manage Engine from 9.2 (9238) to 9.4 (9414).
We look at https://www.manageengine.com/products/service-desk/service-packs.html but there aren't steps from our version.

Anyone could help us?

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