You're old license will not be good if it is expired. When you renewed they should have given you a temporary paper license until you recieve you're new one. If you renewed online then you should have been able to print a receipt or some other proof of renewal. Either way, a long as it is in their system that you have actually renewed it, then you should be fine if you get pulled over. If they run you're info it should still come back as being valid and renewed.
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That, and the receipt you got when you renewed proves you did renew.
You're old license will not be good if it is expired. When you renewed they should have given you a temporary paper license until you recieve you're new one. If you renewed online then you should have been able to print a receipt or some other proof of renewal. Either way, a long as it is in their system that you have actually renewed it, then you should be fine if you get pulled over. If they run you're info it should still come back as being valid and renewed.