Joomla 4 is designed for everyone who want build new sites with or migrate from Joomla RC to Joomla stable and also from the Joomla 3.10 series as well as from Joomla 2.5 series.
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New installation instructions and technical requirements
How to upgrade to Joomla 4?
The first step will be to update your site to Joomla 3.10. The Joomla 3.10 The Pre-update Checker will show you which extensions are compatible with Joomla 4.0 (great, isn’t it?). And then, you just have to follow the tutorial: How to Upgrade Joomla 3 to Joomla 4 Step by Step.
Joomla 3.10
Joomla 3.10 is the bridge between Joomla 4 and Joomla 3.x. Going from 3.9 to 4.0 is a migration. You would need to upgrade your J3.9 to J3.10. Joomla 3.10 stable is primarily a release containing backports of API changes from the Joomla 4.0 to help ease the transition to the next major release for the community. Joomla 3.10 will be supported for 2 years after it has been finally released.
Once your website is updated to 3.10, the pre-update checker will allow you to check the compatibility with the Joomla 4.0 minimum requirements in terms of the current hosting environment and, more importantly, your installed extensions. This will help you migrate to Joomla 4.0 smoothly.
Joomla 4 is a major release that we will update all our Joomla templates, Joomla extensions to Joomla 4 as soon as possible. Follow us for latest news!
Follow up all of the news of Joomla 4:
→ How to Migrate Joomla 3 to Joomla 4 Step by Step Tutorial
→ [SmartAddons] Products Support Status & Joomla 4 Update Plan
→ Joomla Announcement - Joomla 4 Stable 17th August