I shared MSE log that I found to be useful. There are few last log entries. If you will need older logs or link is gone - feel free to ask me in comments.
HNY

Either turn the anti-virus off or make an exception for SFD in it by toying with its settings. Download the game again and run it with the anti-virus off or with the exception settings present. It's not that difficult, we have already identified your problem and the rest of the troubleshooting is up to you.




The links do exactly what they say they do.




Ensure every required program to run SFD is installed on your computer. Here's a list.


Some change in the launcher code attracted the antivirus attention, usually security programs have to check several things before judging a file as a malware, some of these are:
Thank you for explanationJakSparro98 wrote: ↑Sat Dec 30, 2017 12:39 amSome change in the launcher code attracted the antivirus attention, usually security programs have to check several things before judging a file as a malware, some of these are:
No One antivirus on Earth are free from false positives, and when the heuristic search was introduced the amount of bad classification of legit applications has skyrocketed, there is no reason to believe that the SFD launcher is really a problem for your computer.
- Possible harmfull pattern: suspect function calls.
- Database search: the executable is compared with others in a large database containing all the known viruses discovered, I strongly exclude this hypothesis for this case because most of these databases are manually updated and so they contains true threats, not false positives.
- Missing software certificate: I think this is what causes the launcher from being deleted; a certificate is the proof that a particular program is free from harmfull code, this certificate must be purchased though.