Сам не пробовал но с asplinux.ru

Зачем монтировать диски вручную во время установки, обманывая установщик.
Попробуйте сделать так, как описано в README ASP10

For successful mounting of ASPLinux ISO images on hard disk partition you should create
text file asplinux.$$$ with relative path to downloaded image(s) and place
this file in the root directory of partition with image(s).

For example, if asplinux-d1.iso is located in
D:\Download\Distrib\Linux\ASPLinux\ file asplinux.$$$ should contain the
following text string:
ASPLinuxImage1=Download\ASPLinux\Distrib\Linux\ASPLinux\asplinux-d1.iso If
you have downloaded more than one ASPLinux CD images you should add
similar line for each image with proper image name and number (e.g.
ASPLinuxImage2=...asplinux-d2.iso). File asplinux.$$$ itself should be
located on D:\