Halionsonic 1.6 under Mac OSX Yosemite

I’ve had a copy of HS 1 for ages an decided to get the latest version - the version I had is 32 bit.

The 1.5 content part installs fine, but the 1.63 Update part tells me I need at least OSX.6 0- it obviously hasn’t heard of the current version and doesn’t recognise it.

Can this version of HS1 be installed somehow? Not interested in HS 2 unless I get some use out of HS1…