Admin Module Missing in GUI / Upgrading

I have a PBX that has been no trouble for many years; I now need to make some changes and have found that the Admin module is missing. The distro is V14 .. I have tried all methods with the help of chatgpt; but is appears the V14 distro is longer to be found. Can anyone help with this; or advise on a route to upgrade this to latest runtime .. I am conscious that if I do a upgrade that I will lose the config and run into problems and could be left with no phone system and door access devices?

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