No, there is no way you can be infected with a virus as a direct result of using SwiftKit.

If you, however, associate yourself with illegal activities such as Macroing, Warez, Pornography etc. you may become infected with a virus (such as a Keylogger). To prevent being infected, we recommend using the latest version of your Operating System (OS) and scanning regularly with an up-to-date Anti-virus system.

Are the SwiftKit Updates safe?

The simple answer is yes, it is not possible for malicous updates to be pushed out via the SwiftKit Launcher. The reason for this is because the Launcher protects you from any unofficial updates, for example the unlikely event that an update server ever got compromised. The launcher does this by checking the integrity of all updates downloaded, if the integrity check fails it will immediately stop the update and delete the file.