If a trip shows that there are 'No Upgrades Available', this could be because Seatfrog doesn't have an allocation of First Class seats on this particular service or that upgrades are not yet available.
As Seatfrog upgrades are last-minute, they're not always available in advance - schedules get updated every few weeks. You can see our upgrade schedule for each rail operator here.
If upgrades are not available at the time, we recommend rechecking the app again, closer to your travel date.