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Yes, the activities with that subject will only use one room out of that three rooms. (If you need more then 1 room for an activity, then please read the help about virtual rooms)

Yes. That is exactly why roomS constraint are available in FET. So don't use the room constraint. Just use the roomS constraint.

Yes, of course. See the manual chapter "Add a fortnightly activity": https://www.timetabling.de/manual/FET-manual.en.html#id_36

This is an Qt error. You should ask in the Qt forum:
https://forum.qt.io/

I can see that you try to download the android version. I tried that the last time some years ago and it didn't work. But since some years past now, it might work. Let me know if you can run FET on android. Even i don't see a good reason for running FET on android, since the screen size of android devices (phones) are normally much too small for a tool like FET and also the cell is much too small to run it for a longer time on full load. But maybe you try to use an android TV? But i fear those CPUs are not optimized for fast computing, they are normally optimized for fast encoding videos, but that is mostly done by the GPU, not the CPU.

Attach the latest file if you still need help.

ah.. Sorry. There might be only a few bugs in your data set, but there might be also many. Difficult to see that so quick since i don't know your school system. It is late here already (23:51) and i must wake up at 06:00 and drive to work. Sorry, but i must go to sleep in a few minutes.
First of all you must decide if you want to work with Fet official mode (i guess that is ok, since you work only up to 01:20 and don't work in the (late) afternoon) or the FET MA version.
After that please solve the bug with group ARAVALLI. In best case it is already working. In worst case you can ask here again, but i won't answer before 14:00) So i won't answer in the next 14 hours.
Not sure, i guess Liviu will wake up in around 7 hours. I fear a bit there won't answer other guys sooner. The other guys that write here sometimes are mainly also located in Europe, so they will probably all sleep right now.

If the teachers are allowed to teach the whole day, then use the official mode.
You can add the 6 days and 8 (or 9) hours like you already done.
In my opinion the break is "unneeded" to add (so add only 8 hours per day), but you can also add it if you thing it is better. You must know the activities with duration > 2 can not be placed over a break. But a break is in fact not needed to disallow it.

If the teachers are only allowed to work before the break OR (not both) after the break each day, then you need to use the MA mode. But in that mode you must double the days (so 10 (half)-days), but you only need to add 4 hours per day.

There are several bugs in the file.
The first bug is, that group ARAVALLI has 2 hours too much.
I generated a timetables that has 2 slots more, so you can see better how a timetable of that group might look like. First of all you need to remove 2 activities of that group.

Well, without more information you can only get the help above.
How about some more details and in best case even your fet data file?

hm.. I think this variant is fine for teachers.
But for students it is maybe better to add an activity with the preferred time, so students can see the activity.

I must also say that it is annoying if it ask each time. I like to have it without asking. So maybe do it optionally.

In fact with the multi core generating it is also annoying. Why must a user delete the old files manually, FET might ask if it can overwrite the files or maybe even better delete the whole folder (since you might generate less files than before and it might be a bit strange if there are old and new files in the same folder.)

It's depending on how long he is absent. If he is absent for 3 month or more, then i recommend to generate a totally new timetable. If he is absent for a few weeks, then you can try to lock all the other activities and generate again. It is very easy if an other teacher can do all his work, but it will be more complicated (in worst case even impossible) if other current teachers must do his work.
If he is absent only for a short time, then i recommend to import your FET file into TiTiTo and use that tool.
see:
https://lalescu.ro/liviu/fet/forum/index.php?topic=1539.0

It's impossible to modify the split. You sadly need to delete the activity and add it once again with the correct split.

Yes, i recommend to delete the breaks, since they are every day the same, so unneeded information. In my opinion you should use a break constraints only if it is different on at least 2 days.

If you want to keep the breaks, then you need to split the activities. You can not place ONE activity over a break, it must be split into 2 (or more) parts.

I added the results from user HITCHER_I from the www.computerbase.de forum.
see: https://www.computerbase.de/forum/threads/wer-kann-auf-einer-aktuellen-400-x-eur-cpu-einen-benchmark-durchfuehren-benchmark-einer-stundenplan-software.2164680/

Thank you!