From the web site:
RawTherapee 5.8 has been released! Windows Build Repackaged We found an issue with the original 5.8 Windows installer, it was missing the Profiled Lens Correction (Lensfun) database, so there is now a new installer from 2020-02-06 which includes this database. If you downloaded RawTherapee 5.8...
- Automatically recover detail lost to lens blur (diffraction) using the new Capture Sharpening tool, located in the “Raw” tab. It takes place right after demosaicing, and as it works in linear space it is not prone to haloing. Capture Sharpening in combination with Post-Resize Sharpening allows for detailed and crisp results.
- CR3 support: image data is decoded so you can process your raw files, but metadata is not supported yet. If you have an ICC or DCP input profile for your CR3-producing camera, you will need to point RawTherapee to it manually (Color tab > Color Management > Input Profile > Custom).
- Improvements of various camera models (new DCP dual-illuminant input profiles, raw crops, white levels, etc.), speedups and optimizations to various tools, better memory management, various bug fixes. See the git log for details.