Desktop GPT doesnt show up anywhere for me to download

DesktopGPT is exclusive to Object Desktop. If already own a Stardock software product, there is an upgrade path. Just click the blue "Upgrade" button on the purchase page and enter the info requested.

https://www.stardock.com/products/desktopgpt/

If you already own a subscription to Object Desktop, see this post

https://forums.stardock.com/530301/page/1/#3942346

If you have an active Object Desktop subscription, it's available in your downloads: https://store.stardock.com/myaccount/products Click the "View Individual Downloads" on the Object Desktop tab.