Unable to upgrade Lightroom CC 2015.1

Thank you kindly for this advice, I got through to Adobe today to secure a down load link for version 11 (https://ccmdls.adobe.com/AdobeESD/LTRM/11.0/macuniversal/e87e5d76-3092-49a4-958c-83f6334874b8/LR_11.0_202110120910-0bccc70d.release_macuniversal_ESD.dmg?token=exp=1722590603~hmac=d595a66f00c7ff79e1e68ebe1424d12e869f3d975a047a4eb5598d8cee2e9e25)

So I'm now up and running with v11.0 but can no further on MacOS 10.15.7 so not able to update to 11.4 to interconnect with mobile apps.  This will have to suffice until I acquire a new AppleMac.

running on MacOs 10.15.7 (Catalina)

So, for LrC, looking at the system requirements, your MACOS will support LrC v11 (see REF 1) and not newer than that (see REF 2 and 4). This will be a big problem as the Creative Cloud Desktop App will present only LrC v13, and v12 (see RED 4).

You will need to contact Adobe to acquire a link for a v11 install.

• REF (1) LrC Sys Req October 2021 release (version 11.0) and later
• REF (2) LrC Sys Req October 2022 release (version 12.0) and later
• REF (3) LrC SYS REQ October 2023 release (version 13.0) and later
• REF (4) Install previous versions of your Creative Cloud apps

The built in 'Update' function under the 'Help' tab does nothing.

That is a very old method of updating. Oh it can still work, but it is (if working) just an extra step to get to the Creative Cloud Desktop.

Now that being said, As you are apparently way way behind in updates (CC 2015.1 years ago, I think back in 2017), I think I should ask, what Adobe Plan are you subscribed to?