Trying to update ACF 4.3.9

I have a site which I am trying to get up to up to date with the latest version of ACF

It has been running the non pro version of ACF up til now, and the following extensions

Advanced Custom Fields 4.3.9

Advanced Custom Fields: Gallery Field 1.1.1

Advanced Custom Fields: Repeater Field 1.0.1

I have tried updating the very latest version, and also step by step from 4 to 5 to 6

The extensions which I believe used to be individual premium plugins are no longer available.

each time a database upgrade is triggered, it knocks out all my repeater fields, they seem to just dissappear.

We have a developers license for ACF Pro at our disposal too, so can update it to this if required, but the same thing seems to happen.

Can you help me figure out a way to get this up to date?

Many thanks

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