Thanks boneyard for the response.
I have gone through the thread you provided but it left me little confused.
I think they are talking about the same license key (Evaluation) using 3 times on the same controller, isn't it?
I want to know that if i use 4 different evaluation licenses keys (one after another), say LIC-2048-AP, in the span of 4 months then will the system let me do that without having to "write erase all" or trashing the config file?
If the above statement (in bold) is true then what would be the temporary solution to continue using the evaluation licenses for the 4th month? Dumping the config file and re-uploaded the same will do?
Any suggestion please.