activation error

We have purchased Draft sight standard, in one system we have installed license that system got corrupted so that we cant deactivate that key ,now we  have installed new OS to same system but now are not able activate that key Getting this error "What causes "Activation transaction failed. Activation count exceeded...3/0" when trying to activate my license?<https://www.draftsight.com/faq/what-causes-activation-transaction-failed-activation-count-exceeded30-when-trying-activate-my>"