JFYI. This is a known issue for the latest PhotoLab 5.2 as responded from a support ticket.
The DNG file captured by Leica SL2-S and Sigma DG DN 14-24mm f2.8 lens can not be opened by PhotoLab 5, instead the error message is prompted as “Internal error (Correction failed on the execute stage)”.
Hopefully, it will be fixed very soon. My trial peroid for PurRaw, which works fine, will be expired in two days.