This is a post from the official Vogons thread:
To use this run rlauncher. Exe and it should have dos and windows tabs. Currently dosbox-staging isn't in the release, it's incomplete and slightly unstable. To run a game /dosbox highlight it in the list and click launch.
For Windows apps, from the windows tab click add app and browse to the folder where the game is. You can configure upscaling settings for the game by clicking the rendition settings button. This is a per app config and some apps like myth-tfl and gpl shouldn't be upscaled (resolution set to default). Gpl can be set to use higher resolutions from within the game. Interstate '76, i'76 nitro and MechWarrior 2 need dxwnd to run. Heavy gear 2 can use dxwnd or dgvoodoo's direct draw dlls (placed in the game folder). Dxwnd and dgvoodoo allow for emulation of direct draw in rready, which is opengl based.
Additional patches for games like quake2 can be downloaded automatically with the freeware alpha (which is watermarked with text). The store based version doesn't have a watermark, but lacks the auto-downloader. Links to download the patches are supplied in the help file in the store based version. Forced fullscreen is only used with the rendition supplied build ref-v1k for vquake2. RReady downloads or provides links to an updated ref-v1k which can run fullscreen or windowed on win 10/11.
Dos games share rendition settings and all of them can be upscaled. Dosbox settings opens the config files for dosbox. Additional application specific config can be created in the %localappdata%/dosbox folder (i.e. Vquake.exe.config) which overrides [cpu], [rendition] and one setting in [sdl] (priority).
Sierra games like the nascar games need threadsafe=true in [rendition]. Icr2/cart might also need it. Using high-poly carsets you'll need to set threadsafe=true and cycles=400000 in the [cpu] section. Fast single core performance is needed for this. The stock game, including custom tracks should run fine (incl. The enhanced tracks supplied with the game) with a discrete gpu, even older ones. Integer cpu performance is what dos games need with rready.
Staging should allow vquake 1 to run without audio pops/static. But it's not ready yet. I'm struggling with keyboard mouse input with staging. Both these things work with lockups/glitches. Eventually staging will be an option in the DOS tab, in the list. Vquake does run without static at 320x200 (upscaled) with vanilla dosbox as the emulated cpu load is lower.
RReady is closed source, and uses named pipe communication with dosclient.exe which uses the wrapper so I don't think dosbox or staging will integrate it it. I do intend to eventually open source rready, but not just yet. Also in the current implementation some non-rendition dos apps might not work. I've minimised this as best as I can, but I can't realistically test everything. If I get any reports of stuff not working , I can fix it.
@Raven-05 has discovered a few games/demos which appear to have disabled rredline codepaths. So I'll be looking at getting them working as well, assuming the code works.
[EDIT] An updated version of the help doc is available here:
https://nirvtek.com/downloads/RReady Rendition Verite Wrapper.pdf