ok, changing the password solved the problem, so thanks for the advice!
Btw, I haven't any special characters but the password was very long and maybe this was the problem..
I run updater and I was able to update one file "System Reboot" but I wasn't able to update "Multiviewer".. In the main window I can see that there is a new version available but when i try to download it, updater told me that the file is missing on the server.. Do you know why?