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Can I install Adobe Acrobat 9 on a PC with Windows 7 (64-bit) and then upgrade to a later version of Adobe?
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acrobat 9 doesn't qualify for an upgrade, but if it did you would not need to install it prior to installing the upgraded acrobat, Plans and pricing | Adobe Acrobat DC
with all adobe upgrades, if a qualifying product is not detected by the installer you are offered a dropdown from which to select the qualifying product. you are then required to enter your serial number for the qualifying product before installation of the upgrade continues.