Some have to update to later versions, then 6183, because newer versions of SF fixed issues for them.
There were several added fixes to Netflix in itself
Other than Win11Pro issues, I have not had trouble with streamfab lately. Although it could have been the power outage that caused it.
Windows 11 Network reset was needed as well as Windows firewall needed to be reset. And that was to fix YouTube downloader because somehow Windows firewall blocked streamfab YouTube downloader and the only way to fix it was to do the resets.
I will admit that for a very long time, I got away with using SF updater and had no issues, but once more and more problems came, it really don't take that much effort to uninstall older and install new and/or delete log and temp folders etc.
But anyway, OP was unwilling to listen. I got to where I try in the following order if I have issues.
#1 - I have streamfab use default for log storage, so I go to Documents\DVDFab\StreamFab and delete everything there.
If that doesn't work I already have offline installers, get as many as you can, unless you have the extended download service. In one of my purchases from dvdfab I got the extended download service.
#2 - I uninstall SF and then install from the offline installer.
ONE or BOTH usually fix most issues. If not, then it's time to show parts of your log so that everyone can see the error, as only 'specific' members can read the log if attached like OP has done.
P.S. There were rare occasions where in uninstalling I also needed it to remove the SF settings by checking the checkbox for it.
OP did not want to uninstall and then install again. Amazon works, or I would be posting so, as that is used a lot by me as well as many others use it.
I tried several movies many times and series and NO error, let alone a 318, and seems not many know what ErrorCode: 318 is. again maybe the logs tells more, but can't say.
Another thing I tried to tell people before, there are at minimum 2 programs I use that, if an update comes, you download the full installer, and it then starts to uninstall the older version and then installs new.
Also, if others have not noticed, the OP gave up as stated in this post. Probably listening to others to either use an SF clone or screen recorder to download from streaming sites.
But it was easier for OP to be no longer interested. And also hate to read between the lines. But with the so-called testing, the op alludes to, I wonder if it was a cracked version of SF as you usually only get 3 downloads without buying,
There are way too many variables, but once someone pays they need to try, try again because you can't make use of the program if it's not working for you.