Internet-in-a-Box (IIAB) 6.4 Release Notes are here:

   https://github.com/iiab/iiab/wiki/IIAB-6.4-Release-Notes

To install IIAB 6.4 onto XO-1.5 laptops, please read:
https://github.com/iiab/iiab/wiki/IIAB-Installation#do-everything-from-scratch

Please post your specific needs to our http://iiab.io discussion forums where
we make an extra effort to assist all XO/Sugar users given our One Laptop per
Child (OLPC) heritage.

Thanks For Building Your Own Library To Serve All !

An especially big thank you to the many countries/communities who've worked
non-stop doing this, to bring about IIAB 6.4: http://wiki.iiab.io/6.4

IIAB Development Team
http://FAQ.IIAB.IO