Upgrading from Drupal 6 to Drupal 7
87608
Drupal 6 To 7 Migration
25224
Updating to latest Blender version
13646
How to tell if a site is using Drupal 7
97493
How can I downgrade from PHP 7 to PHP 5.6 on Ubuntu 16.04?
93138
What is the difference between php and php7.2 packages?
123950
How to upgrade only core with drush?
7095
How do I install different (upgrade or downgrade) PHP version in still supported Ubuntu release?
122175
SharePoint Migration 2007 to 2013
90054
Importing Nodes to D7 with all custom fields
8305
Make mod_wsgi use python2.7.2 instead of python2.6?
81326
Export/Deploy Drupal site/page to static? (no cache)
82712
How to migrate MongoDB 2.4.14 file to MongoDB 3.6?
85946
Upgrading Python
47002
How do I downgrade to Subversion 1.6?
103445
Will painless upgrading from Drupal 8 alpha 3.x to beta be possible?
123678
"Declaration of  must be compatible with " in Drupal 8.6.10
12578
How do I upgrade to a newer version of Ubuntu?