I have seen here: https://www.phpbb.com/downloads/
that the 3.1.8 is the latest phpbb package... Since my board run with 3.0.12 edition,
can you please let me know how to update to 3.1.8.. Shall, I do some special precautions because I had lost
some intermediate updates?
The latest version of 3.0.x is also on that page. 3.0.14
To go to 3.1.x you will lose all of your MODs and styles.
Your server must be running at least PHP 5.3.3
Most MODs for 3.0.x are incompatible with 3.1.x and their functionality will be removed in the update process.
Styles for 3.0.x cannot be installed or used on 3.1.x.
Backup up your board's files and database
Deactivate all styles except for prosilver
Ensure that the activated spambot countermeasure is one of the standard phpBB plugins (Simple image, GD image, GD 3D image, Q&A, reCaptacha).
Set British English as the only language pack
Delete all of your phpBB 3.0.x files EXCEPT for the following:
The config.php file
The /images/ directory
The /files/ directory
The /store/ directory
Upload the contents of the phpBB3 directory from the uncompressed 3.1.x Full Package (EXCEPT for config.php) into your forum's directory (Note: you don't want to overwrite your original config.php file)
Browse to www.example.com/install/database_update.php