David, thanks for your post and your feedback.
I have a long answer and a short answer for you.
The short answer is that the current version of Qcodo no longer includes the web-based codegen tool. The only way to do codegen is via the CLI (command line interface).
For a longer explanation -- as a framework overall, we are moving development tools towards the CLI and away from the web. The primary reason for this is simply the robustness and flexibility that we gain via using the CLI, as it gives us significantly more options with which we can develop these tools.
I know that there are some devs and dev teams that this may be difficult for... especially for folks who don't have access to a shell due to developing on a shared hosted environment (such as yourself). However, for those in that position, I would actually strongly encourage you to consider a development environment where you would have access to a shell. The best and easiest option that I have seen, for most developers, would be to install something like XAMPP locally, so that you have full-fledged LAMP environment with which you can develop in (and which includes CLI capability). And then when you're ready to deploy or do a build and release to your shared hosted environment, you can either push the code to your host (e.g. via SFTP or something like that) or you can use a combination of a SCM and a build script of some kind to push or pull from/to your SCM host.
There is a workaround if you did want to stay with using the web-based tool -- you can simply copy the old codegen.php from an older release and place it into your docroot... and I believe it should just be able to run. I actually had thought about making a QPM package for it to make it easier for folks... but that of course would shed light on another issue; you would still need CLI access to run the QPM tools.
Which I guess brings me back to my original point -- for Qcodo development, because of the toolset that is already there and because of the tools that will continue to be developed on CLI, I would strongly recommend developing in a local environment that allows you CLI access. Then, you can take advantage of all the tools to install QPM Packages from other people, do quick and easy Qcodo upgrades as new versions of Qcodo come out, etc.
Hope that makes sense...