can't download extended function from Safari

[monica65]

I tried to install evernote's web clipper and fastestube, two safari's extended function programs but can't.

I used appcleaner to wipe out any unsuccessful downloads of these two programs and restart the computer. However, after I clicked to install the programs, a new window still pops out telling me unable to install the extended function. I suspected that it has something to do with my anti-virus program of Kaspersky.

Any suggestion?

 

[simsaladimbamba]

What Mac OS X version and Safari version do you use? Can you share the download links for the extensions?

And have you tried disabling Kaspersky?

As to AppCleaner, it is not really thorough.

Best way to FULLY DELETE a program without the need of any additional, inefficient applications

Visual presentation of the steps outlined in above link:

As to Kaspersky:
Currently there are zero viruses affecting Mac OS X in public circulation, but there are other kinds of malware existing, that can infect your Mac, but that can be avoided via employing the proper security steps without the help of any anti virus software.
To learn more about malware in Mac OS X and what steps can be taken to protect yourself, read the following F.A.Q.:

Mac Virus/Malware Info by GGJstudios​