Update REST2 extension Only

Could I update rest2 extension only? I’m currently using 5.0.1 and rest2 is already exists. But I want to upgrade only rest2 extension not RT Version. Is it possible? When I install REST2 extension, It shows like that.
**** Error: Your installed version of RT (5.0.1) already
contains this extension in core, so you don’t need to
install it.

        Check https://docs.bestpractical.com/rt/5.0.1/RT_Config.html
        to configure it.

I think it’d be difficult (some git magic) since you’re no longer using the extension but instead a core feature

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Thanks for your answer. I found a way to solve luckily, I don’t need to install extension.