Remember that you can have aditional entitlements like TDI (Tivoli Directory Integrator) or LMC (Lotus Mobile Connect). Hope it can help finding products by its part number.
Date: 2011oct 4th
Quick Start Guide and Release Notes CI1L0ML - Quick Start Guide - IBM Lotus Notes and Domino V8.5.3 Multilingual - 3 MB
CI1L1EN - IBM Lotus Notes and Domino V8.5.3 Release Notes English - 1 MB
IBM Lotus Notes Client 8.5.3
Windows 7 Enterprise, Windows 7 Ultimate, Windows Vista Business, Windows Vista Enterprise, Windows Vista Ultimate, Windows XP Professional CI1L2EN - IBM Lotus Notes Client V8.5.3 Basic Configuration for Windows English - 182 MB
CI1L4EN - IBM Lotus Notes Client V8.5.3 for Windows English - 524 MB
CI1MUML - IBM Lotus Notes Dictionaries V8.5.3 for Windows Multilingual - 19 MB
CI243ML - IBM Lotus Notes XTAF Dictionaries V8.5.3 for Windows and Linux Multilingual - 13 MB
CI1LQEN - IBM Lotus Notes, Domino Designer and Admin V8.5.3 for Windows XP, Vista and Windows 7 32 Bit English - 687 MB
CI1MZEN - IBM Lotus Domino Offline Services Client Preinstaller for Notes/Domino V8.5.3 English -145 MB
CI1N0EN - IBM Lotus Domino Global Workbench V8.5.3 for Windows English - 47 MB
Mac OS Leopard, Mac OS Lion CI1L3EN - IBM Lotus Notes Client V8.5.3 Basic Configuration for Mac English - 163 MB
CI1L7EN - IBM Lotus Notes Client V8.5.3 for MAC English - 421 MB
CI1MWML - IBM Lotus Notes Dictionaries V8.5.3 for Mac Multilingual - 20 MB
CI244ML - IBM Lotus Notes XTAF Dictionaries V8.5.3 for Mac Multilingual - 9 MB
Linux CI1L5EN - IBM Lotus Notes Client V8.5.3 for Linux (RPM Install) English - 508 MB
CI1L6EN - IBM Lotus Notes Client V8.5.3 for Linux (Debian Install) English - 526 MB
CI1MVML - IBM Lotus Notes Dictionaries V8.5.3 for Linux Multilingual - 19 MB
CI243ML - IBM Lotus Notes XTAF Dictionaries V8.5.3 for Windows and Linux Multilingual - 13 MB
IBM Lotus Traveler 8.5.3.1 CI4KLML - IBM Lotus Notes Traveler V8.5.3.1 for Windows Multilingual - 177 MB -
15 Nov 2011 CI4KMML - IBM Lotus Notes Traveler V8.5.3.1 for Linux for xSeries Multilingual - 183 MB -
15 Nov 2011
IBM Lotus Domino 8.5.3 CI1L8EN - IBM Lotus Domino V8.5.3 32 bit for Windows English - 635 MB
CI1L9EN - IBM Lotus Domino V8.5.3 64 bit for Windows English - 685 MB
CI1LBEN - IBM Lotus Domino V8.5.3 32 bit Linux for xSeries English - 610 MB
CI1LCEN - IBM Lotus Domino V8.5.3 64 bit Linux for zSeries English - 598 MB
CI1LEEN - IBM Lotus Domino V8.5.3 for AIX 32 bit English - 622 MB
CI1LAEN - IBM Lotus Domino V8.5.3 64 bit for AIX English - 628 MB
CI1LDEN - IBM Lotus Domino V8.5.3 32 bit Solaris English - 637 MB
CI1LFEN - IBM Lotus Domino V8.5.3 for IBM i English - 1038 MB
IBM Lotus Notes and Domino 8.5.3 Upgrade Pack 1 CI5HUEN - IBM Lotus Domino V8.5.3 Upgrade Pack 1 English- 410 MB -
3 Feb 2012
IBM Connections Files and Profiles CI2IAML - Quick Start Guide- IBM Connections Files and Profiles for Lotus Notes and Domino V8.5.3 for AIX, Windows, Linux Multilingual - 17 MB
CI351EN - IBM Connections Files and Profiles for Lotus Notes and Domino V8.5.3 Readme English - 1 MB
CI2IBML - IBM Connections Files and Profiles for Lotus Notes and Domino V8.5.3 for Windows Multilingual - 1049 MB
CI2IEML - IBM Connections Files and Profiles for Lotus Notes and Domino V8.5.3 Wizard for Windows Multilingual - 153 MB
CI2ICML - IBM Connections Files and Profiles for Lotus Notes and Domino V8.5.3 for Linux,AIX Multilingual - 1220 MB
CI2IDML - IBM Connections Files and Profiles for Lotus Notes and Domino V8.5.3 for Linux for System z Multilingual - 1066 MB
CI2IFML - IBM Connections Files and Profiles for Lotus Notes and Domino V8.5.3 Wizard for Linux,AIX Multilingual - 305 MB
Date: 2011 jun 11th
IBM Lotus Sametime Entry V8.5.2 for Domino V8.5.3 Multiplatform Multilingual eAssembly CZY9GML - IBM Sametime Standard V8.5.2 Multilingual Multiplatform Quickstart Guide - 5 MB
CZY9XML - IBM Sametime Entry Community Server V8.5.2 Windows Multilingual - 1011 MB
CZY9YML - IBM Sametime Entry Community Server V8.5.2 AIX, Linux, Solaris SPARC Multilingual - 959 MB
CZY9ZML - IBM Sametime Entry Community Server V8.5.2 IBM i Multilingual - 586 MB
CZZ92ML - IBM Sametime Entry Connect Client and Network Installer V8.5.2 Multiplatform Multilingual - 2064 MB
Tools CZ5S8EN - IBM Lotus Domino Configuration Tuner 1.0.0 for Windows English - 2 MB
C84T5NA - Install Shield Tuner for Lotus Notes 7.0.x, 8.0.x and 8.5.x for Windows 2000, 2003 English - 14 MB
Useful Links
Passport Advantage
IBM Lotus Notes 8.5.3 System Requirements
All license agreements by date
Lotus Notes 8.5.3