Do I need pay for it if I use SDK?

SUSE Linux Enterprise Server SLE Software Developer Kit (SDK)
1

I have suse 11 sp3, if I want to use SDK, do I need another pay for it?

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Hi and welcome to the forum :slight_smile:
No the SDK is a free download, you won’t get any updates since it’s EOL…
https://download.suse.com/Download?buildid=hF8sRGTVC04~

DVD2 contains all the src rpms.