Redux is a large-scale modification that attempts to modernize Doom 3 with a massive overhaul of the graphical, sound and UI aspects of the game along with bug fixes, restored content and new features.
I won't have much time to work on Redux for the rest of August, so I'm releasing the Beta a bit earlier than expected ! It's currently uploading and should be available today.
As previously mentionned, Redux 2.0 is already well-polished, so you shouldn't encounter much issues with this test version. However, some features and assets haven't been included due to them not being fully completed.
This is still a major leap over 0.95b, but there's enough missing that I'll recommend you wait for the proper release in late 2019 unless you are in a hurry to replay Doom 3 or you want to help by tracking small issues.