Hello,
I wonder why there is no version 3.6.9 with indi version 2.0.6 or 2.0.7 on RPi4 with Ubuntu 20.04LTS ?
I tried to compile it from sources. Indi compile without problem but the driver for my qhy camera doesn't want to compile.
First I got that result :

[ 12%] Building CXX object CMakeFiles/indi_qhy_focuser.dir/qhy_focuser.cpp.o
/home/observatoire/Projects/indi-3rdparty/indi-qhy/qhy_focuser.cpp:34:10: fatal error: indijson.hpp: No such file or directory
34 | #include <indijson.hpp>

I fixed it with:
#include "/usr/include/libindi/indijson.hpp"

But that wasn't enough. I got that result:

/home/observatoire/Projects/indi-3rdparty/indi-qhy/qhy_focuser.cpp: In member function \u2018virtual bool QFocuser::updateProperties()\u2019:
/home/observatoire/Projects/indi-3rdparty/indi-qhy/qhy_focuser.cpp:132:24: error: cannot convert \u2018INDI::PropertyNumber\u2019 to \u2018const char*\u2019
132 | deleteProperty(TemperatureNP);
| ^~~~~~~~~~~~~
| |
| INDI::PropertyNumber

Stopped all my investigations.
Have you some suggestions ?

I recommend using my script to compile INDI gitea.nouspiro.space/nou/astro-soft-build