I also am wondering how to download the Lightroom Classic SDK.

@Rikk Flohr: Photography  I'm afraid that the link you gave just rotates us back to this page:

https://developer.adobe.com/console/1619670/servicesandapis

Scrolling to Lightroom Classic gives a Downloads button that pops up a panel.

But the Download link in there goes to:

https://ioconsolerykerprod.blob.core.windows.net/adobe-apiplatform-prod-ioconsole-cdn/installers/lr/sdk/2025/cross_platform/v4/LrC_14.3_202504141032-10373aad.release_SDK.zip?sv=2021-08-06&se=2025-06-24T05%3A31%3A01Z&sr=c&sp=r&sig=OUZ9%2FtoTbeiMSfHLDBBTffkudKuXVWEgEQptMy6yjFg%3D

Which does not exist.

It gives an error:

This site can’t be reached

ioconsolerykerprod.blob.core.windows.net’s server IP address could not be found.

Adobe really need to run a link checker on their pages. Especially in the Developer sections. This is the second URL link error I've seen in the last 15 mins