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[Seems like you need MacOS 10.14+](https://support.ledger.com/hc/en-us/articles/4403310017041-Ledger-Live-system-requirements-?docs=true)
You can try to use the older version of Ledger Live (download link for every version used to be on Ledger’s Github, but I’m not sure they are still there since Ledger revamped that repository). That will only be a short term solution since eventually Ledger updates will make the old version incompatible.
Otherwise there is not really a perfect solution besides updating your Mac’s OS if possible, otherwise using a different computer, or maybe installing Linux on your Mac in either a dual boot (boot camp) or virtual machine. (VMware, etc.). Then installing Ledger Live on that Linux system.