Sliphorn unfortunately, that is a bug you found.
You will have to set up the partitions manually using gparted, then use custom install in the installer.
The link above to the Community site also links to a great setting up the partitions guide.

rokytnji wrote:running in live cd mode
log into terminal as root.
type in

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sux

enter password root
type in and post output of

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fdisk -l

that is a lower case L after the dash

Many thanks for alll your help - Antix now appears to be istalled