Rosetta is a software that enables software for Intel Macs to be run on Apple Silicon Macs. If you’re using an Intel Mac, you can already run software for Intel Macs without additional tools. (And in fact, there is no way to install Rosetta on an Intel Mac.) In any case, Anki can run on both Intel and Apple Silicon Macs natively, so there is no need to use Rosetta even if you have an Apple Silicon Mac. I was using Rosetta by mistake, and just shared how I fixed it in my case. If you are using an Intel Mac, this cannot happen to you and Rosetta has no influence whatsoever on whether Anki runs on your Mac or not.
Which means your issue is with something else. Of course you can keep using the slightly older version indefinitely, this is totally fine. If you ever want to update and tackle the issue you’re having, please post more details on what exactly goes wrong in your case. For example, you could try the troubleshooting steps from the Anki Manual (linked above) to start with and tell us how that goes.