Workaround for catalyst 12.8??

[tibit]

Few months ago I bought a notebook with switchable graphics (HD4000 + HD7970m. I can't update my catalyst 12.6 to 12.8. Is there a workaround so I can still use the older hashcat versions like 0.8 or 0.9. I get the message that they are outdated. At this moment I can only use my cpu :-(

thank you.