This problem because of when you are installing Abaqus , the software check system requirements (checking windows version that should be windows 7 or lower)
for solving this problem you just need pass this step in installation
1.open "cmd.exe"
2.go to setup folder with these commends: "cd.." (for level up in folders) and "CD" (for go through folders)
3.then write this : "setup -nosystemchecks"
4. enter
here setup will run and jump over checking your windows8
and just easily install like windows7 ;)
(for step 3 attention to space and dash to wirte correctly)