I had open a case with support for a bug and they sent to my the that :
The Engineering Hotfix has been uploaded successfully. Please log in using either the case-specific credentials or AskF5 credentials.
so could anyone help me to get more infromation about how to deal with hotfix file?
All you need to know is describe on this K article : K55025573: Engineering hotfix installation overview
check also this video : Upgrading and Installing HotfixesRegards