This Add-on Installation page lists all the add-ons you are licensed to install or update.
In most cases the install checkbox is checked by default.
New add-ons you are eligible to install can be unchecked if you'd rather not install them immediately. You can install them later, by running KInstall.exe again.
In some cases an install checkbox may be locked because another add-on depends on it. You must uncheck the dependent add-on, before you can unlock the checkbox of the original add-on.
