where to get testing version of jessie installer?

[Juha Heinanen <jh@tutpro.com>]

I'm back at trying to install Jessie on Acer C720 without going the long
route via Wheezy.

Just to recall, the problem is that current Jessie installer
debian-8.0.0-i386-netinst.iso from April 24, does not boot on Acer
C720.  Testing installer boots, but it is stretch installer.

Does anyone know if there exists a development version of next Jessie
installer somewhere?  Perhaps it would contain the same fix that exists
in testing installer.

-- Juha