install from website "install" button
 

hi, that is: how can I install from a website install button like this one: http://community.linuxmint.com/software/view/xvst
it asks to choose an application to open it and don't know what to put in there
any hint?
thank you!

You need to install apturl for links like that to work.

In a terminal copy and paste
or
and let it install. You should then be able to use links like that to install packages.

Warning: Be very careful using things like this from websites you do not really know. It is very similar to Windows users downloading and installing exe files from unknown websites. The security risks are potentially huge if you are not careful.

thank you very much, for the advice also