SP Upgrade supports transferring between the various Joomla! versions as below:

1.5 -> 2.5
1.5 -> 3.x
1.5 -> 4.x
1.5 -> 5.x
1.5 -> 6.x
1.6 -> 2.5
1.6 -> 3.x
1.6 -> 4.x
1.6 -> 5.x
1.6 -> 6.x
1.7 -> 2.5
1.7 -> 3.x
1.7 -> 4.x
1.7 -> 5.x
1.7 -> 6.x
2.5 -> 3.x
2.5 -> 4.x
2.5 -> 5.x
2.5 -> 6.x
3.x -> 3.x
3.x -> 4.x
4.x -> 4.x
4.x -> 5.x
4.x -> 6.x
5.x -> 5.x
5.x -> 6.x
6.x -> 6.x

• Joomla version 3.x and 4.x supported, refers to all releases of Joomla 3 and 4

The simple process

• Install a new version of Joomla anywhere, (your live server, or a remote server, or even on your PC)
• Install SP Upgrade,
• Connect to the source database,
• Click the transfer button,
• Enjoy your new site.

Migrate everything with with no exceptions.

Core Data:
- Users
- Articles (along with their Sections and Categories)
- Contacts
- Web Links
- News Feeds
- Banners
- Menus ability to transfer all menu items, and not - only of the core components
- Modules ability to transfer all modules, and not only the core
- Tags
- All other extensions data!

Extensions:
- K2
- Kunena
- AcyMailing
- VirtueMart
- BreezingForms
- sh404sef
- JComments
- JEvents
- Community Builder
- ARTIO JoomSEF
- Phoca Download
- Phoca Gallery
- Phoca Guestbook
- Phoca Maps
- jNews