My son and I haven't played MCD for a long time because he is busy playing Minecraft himself. I tried to update MCD many times for the past 2 weeks, but it stuck with an update of 24.9 MB and always says that   "failed to install game".  I also tried to duplicate the launcher_log downloaded from some of bug reports from 2020, which I think is the solution because it solved the problem successfully.

So, what should I do to sovle it?

Thanks a million.