A scaling plan is a firm's schedule for increasing the size you can trade as your funded account proves itself over time. Early on you might be capped to a small number of contracts or shares, and that cap rises after you hit balance milestones or trade for a set number of days. The plan is meant to grow risk gradually instead of handing out full size on day one.
It sets how fast your position size and risk are allowed to grow, which affects both potential payouts and how quickly a rule can be tripped.
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