How to upgrade from an older Mac operating system to macOS Catalina or Big Sur
Many people remember Mac OS X 10.6.8 fondly. Not just 10.6 Snow Leopard, but particularly its very mature 10.6.8 release, the final one in that series. It's considered a stable and perfectly fine version. It’s not a problem—until they want to move to a newer system, particularly macOS Catalina or Big Sur, and find there’s no migration path.
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