I'm not sure if IDM will revert back to trial after 1 year?

they r offering a reduced price of $24.95 now. Check their webpage

If u have revo, try cleaning IDM installation and use the trial for 30days, and thereafter repeat the process

If u have sandboxie, install IDM in it & keep using it.

The only alternate I have used is FDM. though never happen to compare the two.