Hello, the update Process is fine, but where can i see the file changes ?

I made my own theme. Do i have to change something in my theme ?

For themes you can check them out here; https://community.invisionpower.com/index.php?app=core&module=system&controller=plugins&do=diff

Theme changes will occur automatically in those templates that haven't been modified from the default. Any templates that have been modified will not be updated automatically, and you should apply the changes manually using the link Ahmad posted above as a guide.

Crud... So if you haven't be doing this how do you go about doing it? How do you catch up template wise?