does not contain 5.1.9, but many newer versions:
You can install the latest version of the SDK by downloading the RPM at Atlassian Marketplace: Atlassian Plugin SDK - RPM.
Then, from the terminal, enter one of the following commands (depending on whether you use yum or dnf as your package manager):
- sudo dnf install ~/Downloads/atlassian-plugin-sdk-6.2.9.noarch.rpm ; or
- sudo yum localinstall ~/Downloads/atlassian-plugin-sdk-6.2.9.noarch.rpm