I second this issue. Avast is (again) complaining about the main executable devc...
The file provided does not trigger an alert. I have also reescaned the previous files...
Tested Dev-Cpp 5.8.2 No Compiler Portable.7z, Dev-Cpp 5.8.1 TDM-GCC x64 4.8.1 Portable.7z...
Avast false positive alert with 64bit portable package
Avast false positive alert with 64bit portable executable