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I did remove my pledge around noon on the 30th so that I wouldn't get charged for the next month.  My billing history does say that I was charged for April and the supported section says it's for Chapter 3 Image Pack. I might be confused on whether that qualifies me for the post or that was a charge from March

That is indeed the charge from March's update (version 1.03), published on March 31st. And since you removed your pledge before we posted April's charging post, you didn't get version 1.04.

Each charge from this game's updates is included in your next bill. So patrons who got April's update were charged on May's bill. As I said, we don't charge upfront.

If you have more questions, just let me know.