Hi there! I've found a Still River Shell v2.36 while searching for "Still River Shell"+DOS 2.11.
it seems to be part of this shareware CD-ROM:
https://archive.org/details/AllFritz
You can use WinImage to open the image or mount it in Windows using MagicISO.
DOSBox can also mount it, perhaps.
Alternatively, you can look for SRS236.ARC directly.
The SIMTEL FTPs have it, likely.
Here's one, haven't tested it, however (I am typing on a mobile device right now):
http://cd.textfiles.com/simtel/simtel9211/msd … sutl/srs236.arc
Be ware, ARC is an ancient CP/M era file format. It was used in DOS 2.x days mainly, before LHA/LZH and ZIP became popular.
Some of its compression formats are nolonger being recognized by modern ZIP programs.
Better use ARC.COM/ARC.EXE on DOS, maybe in DOSBox..
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