Solved I have a copy of Adobe Acrobat XI Pro currently installed on a PC. I do not believe it was ever registered, just installed with the serial key. - 10900081. Just as you can't get into a house without a key at home, you can't install without a serial key. Also Acrobat XI is a very old product. Due to a change in Adobe's policy, the
Important Contacts have access to all of your organization's information, including product downloads, serial numbers, and purchase histories. Adobe does not recommend adding your reseller to your accounts. Resellers receive separate notifications of your orders. For security reasons, Adobe can add new contacts to an account only with written approval
Theserial number for Adobe is available. This release was created for you, eager to use Adobe Acrobat (all versions) full and without limitations. Our intentions are not to harm Adobe software company but to give the possibility to those who can not pay for any piece of software out there. This should be your intention too, as a user, to fully

kglad Community Expert , Mar 15, 2017. assuming you're using a valid adobe serial number (6 groups of 4 numbers), you have a mismatch between your installation file and serial number. ie, you can have a valid serial number, but if it's for program A and your installation file is for program B, you will see an invalid serial number

3 Download the installation file from the My Adobe website to the new computer. If you purchased Acrobat from Adobe, hover your mouse over your name and select "My Orders." Click the "Download AdobeSupport Policies: Supported Product Versions. Product support is available for the products and versions listed below. Products without a version number are continuously updated, and the latest update is supported. The level of support may differ among versions and among products. Please consult the following pages for more details: eKOT.
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    • adobe acrobat x pro product key