Yes, the launcher is completely free to download and use.
Ensure you have the latest version of installed. While modern Minecraft versions come with their own Java runtime, having a system-wide Java installation (Java 17 or newer for modern MC versions) helps the launcher run smoothly. sklauncher download
The only safe place to download SKlauncher is from their official domain. Avoid "mirror" sites or YouTube links that lead to file-hosting services like MediaFire or Mega. Yes, the launcher is completely free to download and use