I´m sorry guys, but YAC Reader must read new RAR version because a lot of material is coming with this format since a year.
I hope you can make it soon.
Using RAR5 or even RAR for comic files is a nonsense.
Anyway, the developer branch already supports RAR5, you can try to compile the app yourself (
github.com/YACReader/yacreader/tree/develop
). Hopefully I'll release a new version in a new few weeks . I'll try to release an alpha tomorrow..