How to Install adobe reader-enu in 64-bit Debian 8.5?

The last version of Adobe Reader available on Linux is 9.5.5, even in Canonical's partner repository. Adobe Reader has been unsupported on Linux for quite a while, I dare say there are probably a few security vulnerabilities lurking...

You should use Okular or Evince.

If you need features which are only available in Adobe Reader, you should run it in a virtual machine to reduce the level of risk; either version 9.5.5 in a Linux VM, or the current release in a Windows VM (assuming you have the appropriate license). If you take the Linux VM route, you might as well make it a 32-bit VM since that will simplify the installation of Adobe Reader (gdebi will do the right thing on its own, see GAD3R's answer).

Adobe Reader is no longer supported by Adobe on Linux since 2014. Adobe no longer provides security updates for Adobe Reader under Linux.

How to Install adobe reader-enu in 64-bit Debian 8.5?

wget ftp://ftp.adobe.com/pub/adobe/reader/unix/9.x/9.5.5/enu/AdbeRdr9.5.5-1_i386linux_enu.deb
sudo apt-get install gdebi
sudo gdebi AdbeRdr9.5.5-1_i386linux_enu.deb
sudo apt-get install libgtk2.0-0:i386 libnss3-1d:i386 libnspr4-0d:i386 lib32nss-mdns libxml2:i386 libxslt1.1:i386 libstdc++6:i386
sudo apt-get -f install