Upgrading Drupal

Has created a new site - http://www.stankey.ru on drupal 5.12. It is impossible to update to version 5.14 - the base mysql breaks.
What occurs?

I am on Drupal 5.5 and wish to upgrade to 5.15. I presume I can do a straight jump to 5.15 and don't need to do .6 thru .14 before?

Hi,
I recently upgraded my site from 5.14 to 5.15 and received the White Screen of death when I ran update.php.

My error logs tell me nothing. In fact, no errors were even reported.

In my .htaccess file I force use of PHP5 by using the AddHandler command and it has worked for me for years. Now I notice I can only access my update page if I remove it. Problem is my host - Site5 - is running PHP4 by default and some of my scripts require PHP5, so of course I get errors on those when I run update.

Any suggestions on how I can fix this?

Step six says to "remove all old files and directories from the drupal installation directory". What does this mean? What files or folders? and which directory is the installation directory?

I already copied my files and sites folders to my computer. I am assuming that I am going to copy them back, right?

I did an upgrade from 6.4 -> 6.5 a while back and ran into a few problems so I have been hesitant to upgrade since, I know it is not the best response. Can I now upgrade from 6.5 -> 6.9 or do I have to install all the versions in between?

My drupal 6.4 site will not let me log in no more... is there still a way to update to 6.9 with no log in?