Wrong version number. 10.7.3 actually dates way back to 2010. 10.7 was Lion, not Big Sur. You actually meant 11.7.3. If you bought that Mac used, please tell us the exact model and configuration (CPU, RAM, storage, GPU) that it has. There should have been no Intel Macs at all when you bought that machine (or put it this way, all Macs should have been using Apple M-series silicon). And if you bought a Mac that had macOS 11.7.3 installed, that Mac may have been the base-model MacBook Air, which was the very last M1-powered Mac sold until this past March when Apple officially discontinued selling it in its stores (though the M1 MacBook Air is still sold new at Walmart). The M2 successor to the M1 MacBook Air, which was first introduced in 2022, replaced the base M1 MacBook Air in the Apple lineup with a slight price reduction. And if that Mac of yours were really the M1 MacBook Air, then you should be able to update its macOS all the way to the current version of Sonoma, version 14.6. Only then will you be able to install the current version of Premiere Pro (24.5 as of this posting). And even if you were to keep macOS 11.7.3, then you should be able to install the most recent version of Premiere Pro in the 23.x version family, version 23.6.8. But do so within the next two months before it disappears permanently with the forthcoming release of version 25.
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