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Is upgrading FME server 2019 from x86 to x64 on same machine possible. I have server 2019 x86 installed.

I would treat it as a regular upgrade, see

https://docs.safe.com/fme/html/FME_Server_Documentation/AdminGuide/Upgrading.htm

It miiiight be possible to only upgrade the engine part, but I'm not sure it's worth it unless you're restricted to a particular build number and already have the installer lying about.

You could also potentially run both the x86 and the x64 engines on the same pc. It's also described in the link above.

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