When I try to use my silver coins, the choices always say "sold out".When can I use them to make pur

Mary_Brown-2

Farm Heroes Super Saga:  When can I sue the silver coins, I have over 7,000 and can't use them.  Why give them if you don't allow them to be used.

StuckInATree

Did you already have the booster which you're trying to get? As you can only have one at a time, you can't stack them.