Whenever trying to download any video it is showing "Error - can't download". Till day before yesterday it was working fine. but now not. Logo also comes in different in control panel. I have already re-installed it

Whenever trying to download any video it is showing "Error - can't download". Till day before yesterday it was working fine. but now not. Logo also comes in different in control panel. I have already re-installed it but still it is not working.