keep getting the error:
The developer of this app needs to update it to work with this version of macOS. Contact the developer for more information.
you must have updated your os to an incompatible version. there's not going to be an update. you can't download an update.
in the future, to find the best place to post your message, use the list here, https://community.adobe.com/
p.s. i don't think the adobe website, and forums in particular, are easy to navigate, so don't spend a lot of time searching that forum list. do your best and we'll move the post (like this one has already been moved) if it helps you get responses.
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CS6 cannot be installed on MacOS versions after Mojave (10.14.) You'll need to switch to Creative Cloud subscription.