I just upgraded to PL5 (V5.4) so I have to download/install a number of camera/lens modules and usually just let PL decide when they are needed. It works most of the time but several times now it has failed to finish. The Module Installer dialog shows the downloads have happened and it just sits there. I have had a couple others that took 30 seconds or so before completing so I left the dialog up for a while (at least 10 minutes, usually more) and it never completed. I eventually kill off PL via task manager. When I restart it, the lens/camera module appears to be installed and working.
I started a manual install of 9 modules and it took 6 minutes to complete. Not having a progress indicator after the downloads (which went fairly fast, maybe 20 seconds for 9 modules) makes it hard to know if it is hung/crashed or just still working.
You didn’t specify on which system you are Mac or Win?
I can tell you that I’m on Windows 10 and Mac Monterey 12.5.1 and it works on both system without the delay you described. Just this morning at Mac system I downloaded some modules for Canon and Fuji for testing and if I remember correct it must have been about 10 modules and it took me less then 1 minute, and I could work without closing DXO.
So at the moment no idea what happens on your system
And within your Account preferences you could fill your System and Equipment, which makes it more easy for the crowd to answer
A bit more information. I have put PL on my D: drive. Perhaps that is an issue. Also, I just timed a new DxO Optics Module download/install. 67 seconds to get the “completed” dialog box. The progress bars went to full (as shown here in the attached screen shot image) within 2 seconds and then it sat like that for for the rest of the time. The disk seemed to be rattling the entire time. Consistent with previous download/installs.