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when you install the BigSur Beta, does it upgrade the current installation of Catalina (if there is one) or will it always to a fresh install?

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    If you accept all the defaults during the install it will upgrade your Catalina to Big Sur. If this comment doesn't help, you need to add more detail to your question. – fsb Jul 2 '20 at 20:29
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    when I installed BigSur on my testing SSD (which had a copy of Catalina from earlier in the year), the program just upgraded the OS, leaving all of my files and applications in place – Matthew Barclay Jul 3 '20 at 0:02
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It should always be an upgrade.

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