We are sorry for the trouble. As described, the Acrobat Xi is crashing within 10-15 seconds.
You may try to update the application to the version 11.0.23 released on 14th Nov 2017 and see if thsat works for you. Go to Help > Check for updates.
Adobe Acrobat 11 Pro is an old and EOL application it may or may not work properly. Adobe strongly recommends that you upgrade to the latest versions of Adobe Acrobat DC and Adobe Acrobat Reader DC. By upgrading installations to the latest versions, you benefit from the latest functional enhancements and improved security measures.