I have never seen a manual with 83 pages… is there a link?
Seriously, are you kidding?
Every device is being shipped with a printed manual, even if you bought a used device, the previous owner should have / should give to you the manual.
All product pages on the web contain links to the latest version of the manual.
If you are a starter and need to make your way with TotalMix FX, maybe I should give you directly this link which gives you an overview and leads you to additional information resources on the internet.
Very recommendable are the RME video tutorials, which are well-structured and to the point. Doesn't need much time, and you get the best overview of TM FX capabilities and operations that you can think of.
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13