An alternative to autoCVVC that you can use is Presamp. It's available for download here.
http://ch.nicovideo.jp/delta_kimigatame/blomaga/ar477661
There are two files which you need to download, "presamp 0.871" and "predit 1.600".
Before you install anything, you should prepare your UTAU settings so that it will work properly. Go to Tools, then Options, then the Cache tab. Make sure that the checkbox is ticked. Then go to the Rendering tab, and make sure that everything after the first checkbox is NOT ticked. There are pictures if you scroll down on the page I linked.
Then you should run the "presamp 0.871" installer, and when it asks you to select a folder, you should find the folder where UTAU is installed. Once it's installed, you should unzip "predit 1.600" and put it in the plugins folder.
To use it, go to the project properties and set both the resampler and wavtool to presamp.exe. Run the predit plugin to select the real resampler and wavtool. Now, if the UST is in CV hiragana, it can automatically convert to CVVC (and VCV) without needing to edit the UST itself.