When i reloaded acrobat 9 pro and tried to activate it with the serial number i was previously provided it notes that my setup is for an upgrade version of adobe acrobat pro and asks me to select the previous product and enter the serial number.. Activation of acrobat 9 pro. i installed this product (as a purchased download from adobe) in 2011 on my computer which was running xp. i was provided with a serial number which i used and successfully activated the product and used it without problems until earlier this week.. To use adobe software applications such as acrobat 9 pro extended past the 30-day trial period, you must activate them. with a single-user license, you are entitled to install adobe acrobat 9 pro extended on two computers, a primary computer and a secondary computer..
