Applications delete themselves or quit after opening
Almost all of the apps I have downloaded from the internet quit soon after opening, or even delete themselves. Even terminal quits after opening! It is not a disk problem, as first aid turns up nothing. Could I create a partition to possibly solve it? I solved one app by using iTerm2 to open the UNIX executable file, but it does not work for the other apps. I could use safe mode or recovery mode, but unless I use the hash given, I can't. I have run out of possible solutions that work with my limited access. The only cause I can think of is that it might be an unauthorized auto-update of the OS, as that usually causes problems like characters being replaced by question marks.
MacBook Air, macOS Sierra (10.12.6), No SUDO or admin, firmware locked