I was able to download The Secret Life of Pets 1 and 2 on Peacock without issue using 6.1.9.4.
I used the download link in the announcement post to install. Just ran it without uninstalling or any other special process.
The only thing I ever see is Controlled folder access not allowing the installer to write to a protected folder
AGuyWithAComputer
The issue seems to depend on geographic location in the USA and mostly the MSNBC shows. Issue is happening for some, but not all,US residents who do not use a VPN or proxy.
No issues with The Secret Lives of Pets 1 and 2 for me either, just downloaded to test because of your post. Was being discussed in the original thread that
@Wilson.Wang closed and asked that we start a new thread about the MSNBC shows issue. Since, for at least some of us, having the issue it is as it's the same discussion so, unfortunately, re-posting the fact about the info about it being mostly MSNBC shows was overlooked.
Has been occurring since 6.1.9.0 for me and clean uninstalls and even installing on my second computer that Streamfab had never been installed on.
Post 77 at at
https://forum.dvdfab.cn/forum/software-support-english/streamfab/446846-peacock-broken?p=447943#post447943" Well, that ruined my morning.

You are right, there's a problem with Morning Joe and probably the rest of MSNBC (I haven't checked yet). But unlike you, I'm seeing the 0% and 0 segments problem from before 6.1.9.3. I tried all the usual tricks and finally went to my VPN to Boston. Boston finally made it work.
@Wilson.Wang, please have the developer try to fix Peacock again. It appears that there is a problem with shows that originate on MSNBC. Go to the bottom of
https://www.msnbc.com/ for a list of shows."
Post 126 at at
https://forum.dvdfab.cn/forum/software-support-english/streamfab/446846-peacock-broken?p=448435#post448435" Hi,
I will close the thread.
Please try to do a clean uninstall and install first.
Please start a new thread and post the new log file if you still have the problem when downloading videos from Peacock with the latest version 6194.
Please tell us the details if you connected via VPN"