I'm trying to update my site from tiki 1.9RC2 to 1.9RC4 but I have some errors because there are missing some tables (e.g. tiki_newsletter_groups) or in some cases only some fields in some of the tables (e.g. lastModif in tiki_files or scale in tiki_galleries_scales).
Is there any way to convert the DB from one release to the other?
Thanks in advance