When you have the full Daphile installation (made using Daphile's web 
interface installation tool, Settings -> System Firmware), you are 
able to install any specific version (old or pre-release) as follows:

- Access Daphile using http://daphile/cgi-bin/Devel address on web browser
- Insert the download link of the specific version to the input field besides 
  the "Install" button. Eg. for the 14.08 i486 version it is:
 
  http://www.daphile.com/firmware/testing/old/daphile-14.08-b101214-i486.iso

- Press "Install" and restart Daphile after installation has completed

This procedure is not supported on the Live USB Daphile. You just have to
create a new USB drive with unetbootin or similar for each version. 

Don't switch between the same i486 and x86_64 versions if you are using
any version prior to 14.11.