Because there were a lot of questions a better tutorial.
1 Step one we are going to put evry file in the file
system of the SE K850i

*Take from the map Fonts sony erricsson logo
Put the in this map of the file system!
\tpa\preset\system\fonts\
*Put the item from the now playing layout map and
ONE of the layouts from the map Layout in this folder
TPA\SYSTEM\LAYOUT\
*Put ALL items from the Vista horizontal map in
\tpa\preset\system\menu
*Put evrything from the map mini icons in
TPA\System\Icons
Normally the folder does not exist so if you don't
have it create it.
*Put the camera funlayers in this map:
tpa/preset/system/multimedia/pe/funlayer
*If you want you can put the sound driver in
Ifs/settings/accoustics

2 Now we gonna install evrything

A. Put the theme on your mobile and select it.
B. The sidebar some people found it difficult so:
1.Choose were you want to install it on your memory card
or phone. Both is no option.
2.Select the map sidebar in the map vista sidebar.
Copy the complete folder to the
PICTURE folder of your phone so the options are
*Phone/picture after that this path Phone/Picture/sidebar
should be exist.
*Memory card/Picture after that this path memory card/Picture/sidebar
should be exist.
3.Put the file sidebar v2.swf in the picture folder NOT
in the picture/sidebar folder. Again to options memory card
of phone.
4.Choose the sidebar v2.swf file as background and your done :)

Extra info about sidebar:
*You can replace the wallpaper.png file but:
The wallpaper MUST be named wallpaper and MUST be saved in png format else it
won’t load.
*You can change the photo fram picture but:
Again this HAS to be a png file named this way else it won’t work!
*You can change the note pad but:
The note.txt HAS to start with "text=" without quotes. After the = mark you
can type your own text, about 35 characters will fit in the box.