P: LrC 15.4 is temporarily unavailable

See if this helps:

https://community.adobe.com/questions-675/i-can-t-update-lr-classic-to-15-4-i-am-using-a-macbook-pro-on-os-26-5-1-when-i-go-into-cc-it-just-shows-lr-classic-15-3-1-1628745?postid=7688301#post7688301

1. Go to the Creative Cloud app.

2. Sign out.

3. Restart the computer.

4. Go to the Creative Cloud app and sign in. 

5. Click Home in the upper-left corner.

6. Click Updates on the right-end of the row containing Home.

7. If you don’t see LR Classic 15.4, click Check For Updates in the upper-right corner.

I cannot update LR to a version which I have on my laptop. Laptop has 15.4, obtained while on the road in diverse hotels. Home computer has 15.3.1 and Creative Could is not capable to find the V15.4 and to update my main version. Thus a catalog exported with photography on the road cannot be imported to the main workstation at home. 

I can't update LR Classic to 15.4 - I am using a MacBook Pro on OS 26.5.1 - when I go into CC it just shows LR Classic 15.3.1

I was trying to update to the latest version (15.4) of LRC on my M4 Mac Studio and got the slow downloading message.  I quit Creative Cloud and when I restarted it the 15.4 upgrade was not longer there.  Uninstalling LRC and reinstalling it only gets the previous version 15.3.1