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I have Acrobat 9 on a computer that is being replaced. I downloaded and tried to install (I have the serial number) but then it asks for the serial number of the older version of Acrobat (I guess my version 9 was an upgrade). How do I get this installed?
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When you have an upgrade the ONLY way to install is to also have the previous serial number
Log-in to your Adobe account and click this link https://account.adobe.com/products
or
Lost information https://community.adobe.com/t5/account-payment-plan-discussions/trying-to-re-install-adobe-2020-need...
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you need that previous version serial number. then you probably won't be able to activate.
so, either use the free reader or start an acrobat subscription.
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You need to find the qualifying (old version) serial. If you registered it, maybe it will show in your Adobe account.
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it's all moot. activation is not possible.