That's exactly what I did, I tried many times still didn't work.
Edit Splits -> Game Name: Devil May Cry 5 -> Activate -> LiveSplit: Unknown Game Version.
I also deleted and downloaded LiveSplit many times, but nothing changes.
Still, thank you for reply.

When I edit splits, dmc5.asl file always become the old version.(capable patch1.08,1.09)
Even directly edit the file, it reset while activate.
Any solution for this?