Replace settings.Get

[hasancanguler]

If no settings are found for the installer, the Get method fails. To fix this issue, it has been replaced with GetOrDefault, and a null check has been added

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}