New version asked me to buy it again

Cant sign in today, with a message asking me to upgrade. Went into App Store and the app is asking for $4.99 again! I had no choice but to buy it again since my kids school requires her to do it everyday. After installation, there are 2 xtramath apps on my iPad, which basically means they are treated as 2 different apps! Nicely done, xtramath! There are many other better apps out there, if not for the school, I wont even bother to take a look at this one.

Dr_Al_Sl about XtraMath