Translation of nutzbar

The billing of additional working hours is not justified, since it was our request to download the software and wait for the new version. They have admitted the error of the translation.
True, I forgot the 'I' when I have copied and pasted the entire text field. I assume it is the regular form, isn't it? However, the formal form in Spain is a little different to what we are using in Mexico.
Do you like Hamburg? I've never been there. Maybe I can visit it one day. I hope to hear from you and please write me in German, so that you will also learn it. Do not worry about mistakes.