If you own a legitimate license for DxO PhotoLab 9, the official is seamless:
You can activate a single license on up to two computers (Essential edition) or three computers (Elite edition). dxo photolab 9 portable upd
From now on, to perform a DXO PhotoLab 9 portable upd , you simply repeat steps 1-5 on the clean machine whenever a new patch is released, then overwrite your portable folder with the freshly captured build. If you own a legitimate license for DxO