What Loupedeck model, Their are two.
In the following link, LightRoom section , look for “My LightRoom Dosen’t Seem To Work With Loupedeck”. Bit if confusing info, Might work on LoupeDeck+ with Beta2 of the configuration software?? But will not work on LoupeDeck (original). That is Lightroom CC.
Sorry. I have Loupedeck+. It works good on Lightroom Classic but not Lightroom CC.
Check on that Beta v2 update
I'm trying. I went to loupedeck website and its not there.
Select MAC 2.5 or WIN 2.5 (looks like they got past Beta version)
Note issue at bottom of that web page if you have Mac OS 10.11 or older
Ok, then I did that right off the bat.. Somethings wrong. maybe reload software.
While I do not have the Plus version, so the v2.5 will not work, I did download it (the Windows 2.5) for curiosity and to check, Looked at the zip file, looked at the PDF, looks like its what you want.
So, you downloaded it, Unzipped it, then ran it? Note, not all programs behave well if you run then from the zipped folder, sometimes you need to unzip.
According to Loupedeck's twitter... "We don't have access to CC's SDK at this time. If/when we do, then we will provide support."