Hey guys, I just used the updated version of iliberty+ to unlock, activate, and jailbreak my phone. I had to because I previously used ziphone and it is just very unstable and dangerous plus for some unkown reason my wifi won't connect (not greyed out, just won't connect).
However, you are correct. Cydia gets installed but not installer. I played around with iliberty+ options and found it.
Go to tools at the top and click options. Scroll up and click on check updates and the check now box. It will then update the payloads repo to about 22 payloads or so. Go to the bottom where it says available on repo and you will see some good stuff ( installer, bootneuter, ssh, and so on). highlight the ones you want, and hit download. Then go to you local at the bottom and select the ones you just downloaded from the repo. Next click go for it and BAM! there you go, installer back on your iphone!!
Did that help ya?