You can get 2.48 from getdeb.net
Would it be as simple as copying the Yaf(a)ray scripts to the 2.48a scripts folder?
Or change the scripts file path in User Preferences to point to the scripts folder for the 2.46 install.
EDIT - Sorry Yaroslav, my mistake, getdeb.net doesn’t yet have 2.46 for Ibex, but try the scripts folder file path fix.