Here are some answers to your questions.
The cabled network works on my three test receivers. If you refer to wireless, your observation is correct. This is caused by leaving out the very space consuming wireless drivers, so the first step is to add the wireless driver required for you wireless USB network adapter. After adding that to /lib/modules/, restart the box. Then in enigma2 add the driver in the Wireless menu and again restart the box. than add your wireless credentials in the Wireless menu, and it should work. The reason for all this is that enigma2 occupies almost all of the available flash memory on the HS8200 and even adding one WLAN driver makes things very tight.
I may be mistaken, but as far as I know no DVB-T/C tuner exists for the HS8200. The tuners I know of are either DVB-C or DVB-T (of these two versions were made, the early one without an open source driver). The non-DVB-S tuner in your box is therefore not switchable, appears to be a DVB-T tuner. For that reason there is also no way in the menus to set the tuner mode.
Thor: the image is over one year old, and the file satellite.xml (which holds the transponder list) has the same age. I recommend downloading the latest satellites.xml from the net and installing it in /etc/tuxbox. After that restart the box and try a new scan.
I will test IPK install from USB and try and fix it if it broken.
The june 2022 set of images is currently the last set I built and published. The reason for that is that OpenPLi has switched to Python3 and sigc++ version 3. I have still not found time to implement Python3 on SH4 and am a bit hesitant to do so, as everything gets larger with it and involves a LOT of testing. This in turn will probably cause the receivers with 64Mbyte of flash no longer being capable of running E2 from flash; the HS8200 is one of those receivers. As with sigc++ version 3, it requires a c17 capable compiler which we do not have and I have not been able to build one so far. This means everything must be patched back to sigc++ version 2. This again is a lot of work, and will only work as long as OpenPLi does not start using features of sigc++ not present in version 2.
Regards,
Audioniek.