Navision Upgrade

I want to upgrade Navision 4.0 to Navision 4.0 SP2. I do not have any source of information for my upgrade except sourcing information from Internet forum. Below are the useful post / informations that I found regarding Navision upgrade:

Upgrade to Navision 3.7

Using 3.70 Server.exe on 3.10 data

Upgrade to Navision 4.0

Migrate of Navision 3.60 to the version 4
Navision 3.6--> Nav 4.0 Upgrade error
Upgrading Navision client 3.6 to 4.0 issues
V4 Client over 3.7 Database
Windows Permissions to Open Database
Restore Performance problem when upgrading from 3.60 to 4.00

Upgrade to Navision 4.0 SP1

Navision 4.0 to 4.0 SP1
Navision 4.0 Upgrade to SP1
Updating Navision 4.0 to 4.0 SP1
Upgrade from 4.0 to 4.0 SP1
Upgrade from Nav 4.0 to SP1 - when to convert database
SQL Errors upgrading from Nav370 to Nav4 SP1

Upgrade to Navision 4.0 SP2

Navision 4.00 SP2 released
Database Conversion from 3.60 to 4.0SP2 SQL Server option
MBS-Navision W1 4.0 SP2 Update
Upgread navision 4.0 SP1 to SP2
Upgrade Toolkit to upgrade 4.0 to SP2
nav 4.0 to nav 4.0 sp2 upgrade, adjust-cost error
Migrating From Navision SP1 to navision SP2
NAV 4.00 SP2 AND SQL2005?

Upgrade to Navision 4.0 SP3

Upgrade 3.7a - 4.0sp3 on SQL

Upgrading to 4.0 SP3
Technical upgrade to SP3
Upgrade from 3.70B to 4.00SP3

Upgrade from 4.00 to 4.00 SP3

Upgrade to SP3

Upgrade to Navision 5.0

Version 4 or version 5

Developer Toolkit

Why using Developper tool kit?
reliability of the Developer's Toolkit compare & merge
Dev toolkit problem with compare and merge

Others
Weaknesses of Navision