When it was active, the Acrobat XI trial provided for 30 days. After installation, users had a grace period to enter a serial key or purchase a license.
Adobe provides a standard five-year support lifecycle for its products. After October 2017, Adobe ceased all technical support, product updates, and—critically— for Acrobat XI. acrobat xi trial
While Adobe no longer supports it, you may find the original Acrobat XI trial installer on third-party software archives. These are typically old .exe or .dmg files. When it was active, the Acrobat XI trial
: If you have an expired Acrobat XI trial on your machine, you cannot "restart" it. Adobe typically allows only one trial period per user/account. When it was active