I downloaded the trial version of Acrobat Pro DC and the trail version overwrote my Acrobat Pro XI without requesting my permission. I had
Trial versions should not over write existing programs without any warning!!!!
Marking this issue as resolved as there is no response from the user.
Please share following information to help analyze the issue you are facing
1. Is Acrobat XI uninstalled from your machine when you installed trial version of DC?
2. Was yous Acrobat XI serialized with a serial key or is running with a subscription license?
3. How you downloaded and installed Acrobat DC ?
Jack Doyle commented
I downloaded the trial version of Acrobat Pro DC and the trail version overwrote my Acrobat Pro XI without requesting my permission. I had to uninstall the trial version and go thru the timely reinstallation my acrobat pro XI.
While a version of Acrobat is installed, one should be able to install and play around with the trial of another version