Adobe officially ended support for Acrobat XI on October 15, 2017. This means Adobe no longer issues security patches for this version. Because hackers are constantly finding new ways to exploit PDF files, using an outdated, unsupported PDF reader is one of the easiest ways to get your system compromised. 3. Legal and Ethical Issues

While Adobe Acrobat XI Pro 11.0.23 was an incredible piece of software in its prime, searching for and downloading a "fixed" version today is highly discouraged. Between the lack of official security support and the high probability of infecting your computer with malware, the risks far outweigh the benefits.

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