DxO PhotoLab has a number of files with configuration and lens information. PhotoLab offers no option to copy them to a new installation. They're stored in a directory with a name like c:\Users\grog\AppData\Local\DxO\DxO Photolab 5\. This directory looks like:

CAFList5.db		sqlite config file, contains info about lenses, makers and stuff
Cache		Cache, enormous
Modules		Correction modules
Presets		Processing settings
Updates		Config file
Watermarks		empty
Web		Not sure
Workspaces		Screen configuration settings, maybe more
ocl64.cache		Not sure

The ones we need to copy are Modules, Presets and Workspaces.

In addition, there's a directory with a strange name like C:\Users\grog\AppData\Local\DxO\DxO.PhotoLab.exe_StrongName_addo3jomrfkt2faiwwfxxb444r1xfvlh\2.4.0.21\. It contains a single file user.config. This contains some configuration information. It's not clear how much: some is in the files in Workspaces.

Renaming this file is complicated: it appears to be protected under "Windows” 11 at least, and an attempt to rename it brings an incorrect error message:

C:\Users\grog\AppData\Local\DxO\DxO.PhotoLab.exe_StrongName_addo3jomrfkt2faiwwfxxb444r1xfvlh.16.0.4911>ren user.config foo
The syntax of the command is incorrect.

This works as intended if the CMD.EXE is run as “Administrator”, so clearly it's a permissions issue, not a syntax error.