Hello,
PellesC
is a compiler wrote by Orinius Pelle, it doesn't use any tool from 3rd parts. All PellesC (it should be intended Pelle's C) is an original work.
The last release can be downloaded from the
PellesC section->announcements of this forum, that link you to the host domain for downloads.
Said that
I don't think that the problem is the compiler or anything related to the code or the executable, if the problem comes after an OS update be sure that the reason, in the 99.9999999...% of the cases, is a safety upgrade that limited, or blocked, the executable.
Please refer to the upgrade docs on MS knowledge base, maybe your program must run under administrator level, or you have to add exceptions for this program to the firewall, or even the executable must be signed.
Unfortunately from the information you provided we can't deduce anything. What is the update kb code of the upgrade, which part of the program fails (you can recompile it with debug info, then open a debug session find the failing functions then call the GetLastError(), or the appropriate error function, to retrieve the detailed system error code and provide it) and the OS exact error code. All this with a minimal sample to try to reproduce the error.