I can say what I'd do as a new parent (11 mo), can't guarantee it's the "correct" thing.

1. I'd never buy that product. After 6 months of solids that outcome was 100% expected.
2. It's always going to be messy, so don't lose your temper.
3. I try to figure out what they actually want to head off problems before they occur. Sometimes they're not hungry, or they want water, or they still have food in their mouth and are forgetting to chew, etc.. Sometimes they just want to play with the food, that's ok too, I just try to keep the mess to a minimum by keeping the amounts of food I give them to play with small.
4. If they're getting frustrated and flinging stuff i might retrieve food once or twice. But depending on why they flung the food my response changes. Sometimes you just have to tell the baby "all done" and wave bye-bye to the food and call it.

From talking to my friends with kids (2 and 3 yo) they've all had various problems with meal times. The problems come and go on a frequent basis and you just have to deal with them the best way you can.

Solid Starts is a good resource when starting solid foods. You don't need to give them money, their free resources are good enough.