You should be able to set the file as executable by just right clicking then selecting the appropriate box in the permissions tab.
VL 6.0 standard has two different file managers Thunar and pcmanFM. Use pcmanFM, for some reason Thunar's permission tab does not offer to make this file executable.
Navigate to where you have the adobe air download with pcmanFM, right click on the file, choose 'Properties', then 'Permissions' tab, finally select the executable check box for owner.
You will then be able to double click the file to execute.
Unfortunatly, I think you will get an error saying that Adobe Air could not be installed because this is not a supported Linux distribution. Only RPM-and Debian-based Linux distributions are supported.