I just figured out my MBP 2015 will not update because the previous owner replaced the HD with a non apple one. I got open source installed and makeing a installer. I am reading you have to format the HD befor install are you just clearing one section, I am I'm in the process of editing photos for a shoot and do not want to lose it. But I need it upgraded to get some things to work in photoshop can some help
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