Hello,
just for information. Upgrading might fail for duplicate content on some fields who become a primary key.
Unfortunately, the 1.5 install isn't as verbose as 1.4 install:
***1.5 error message*** Making img_name the primary key... Query "ALTER TABLE image ADD PRIMARY KEY img_name (img_name)" failed with error code "".
***1.4 error message*** Making img_name the primary key... Query "ALTER TABLE image ADD PRIMARY KEY img_name (img_name)" failed with error code "Duplicate entry 'README' for key 1".
I suggest for users who have a duplicate content making a crash of 1.5 install, to revert their database and try the install with a 1.4. Then, correct the database by suppressing one of the duplicate content, and redo the 1.5 install.
I hope this is already in bugzilla (if not, maybe someone used to expressing the bug could make it) and the install process in 1.6 are as verbose as in 1.4.
François