Once you have the installer, follow these steps carefully. The 64-bit client installs to C:\Program Files\IBM\Lotus\Notes (not the 32-bit Program Files (x86) ).
: This maintenance release focuses on bug fixes and includes "JVM tuning" capabilities to improve responsiveness on newer 64-bit operating systems like Windows 7 and 8.1. lotus notes client 8.5 3 64 bit download