If you cannot use the official installer (e.g., due to admin rights restrictions), some trusted third-party sites offer a compiled portable version of KTurtle.
If you want to avoid a local installation entirely, you can use KTurtle in your browser. KTurtle - rollApp kturtleexe download for windows install
Since KTurtle is open-source, several trustworthy projects provide Windows installers. Here are the most reliable options: If you cannot use the official installer (e