Version 4 for Mac typically requires macOS 10.14 (Mojave) , 10.15 (Catalina) , or 11.0 (Big Sur) and an Intel Core i7 4th gen or higher with at least 8GB of RAM . Latest version of DxO PhotoLab 4 doesn't work on OSX10.13.6
The Elite Edition includes exclusive features like DeepPRIME , ClearView Plus (for atmospheric haze removal), and batch renaming, which are missing from the Essential version. Version 4 for Mac typically requires macOS 10
It is a one-time purchase (no subscription), but it can be hardware-intensive. DeepPRIME processing, in particular, is effective but can be slow on older machines. Important Safety Warnings ClearView Plus (for atmospheric haze removal)