The old store cart used query strings that this host cannot keep. Pick the same license you saw on the order page, then email support@smallware.com with the license name (single Mac, family, or student). Smallware will send the current checkout path from BMTMicro, the authorized reseller.
Name the Mac you will install on, and say whether you already tried the 100-deal demo. If a prior download never started, mention that too so we can separate a quiet network from a missing receipt.
Every paid license still carries the 30-day guarantee and free upgrades.