You used all free imports.
Most of the software programs offer trials. It can be a time-based (7 days, 14 days etc.) or a usage-based (10 imports, 10 launches etc.) trial. You had a usage-based trial with limited imports. It could have taken you 1 day or 1 year to use all imports but in any case, the trial is only to evaluate the plug-in and to continue using the plug-in you have to buy a license or use only free packs.
We do not offer usage-based trials anymore and we do not extend existing trials.