SP Upgrade supports transferring between the Joomla! versions as below:
| Source Version | Destination Version | |
|---|---|---|
| 1.5 | 2.5 | |
| 1.5 | 3.x | |
| 1.5 | 4.x |
ATTENTION: Please use SP Transfer for upgrading below versions:
| 1.6 | 2.5 | |
| 1.6 | 3.x | |
| 1.7 | 2.5 | |
| 1.7 | 3.x | |
| 2.5 | 2.5 | |
| 2.5 | 3.x | |
| 3.x | 3.x | |
| 2.5 | 4.x | |
| 3.x | 4.x | |
| 4.x | 4.x |