Updating to an new TUTOS release is easy (TM).
Grab the latest release from sourceforge.net
make a copy of all files you have modified
install the new release
migrate your changes carefully ( a simple ooverwrite will not work everytime !! )
read the ChangeLog !! and perform the DB changes if neccessary !! (there is now a file called php/update.php that does all the dirty work. It should work flawlessly but always BACKUP YOUR DATABASE FIRST!
call the update script like this: http://yourhost/tutos/php/update.php?id=XX where XX is the index of your database description in config.pinc. Typically it is 0 (zero).