Before you can enter a key, you need to know which version of the software you are using, as they utilize different licensing systems.
Short answer: No. You should stop searching for a “free eshare license key” and instead follow this decision tree:
Hunting for a cracked EShare license key is a losing game. You will waste hours sifting through virus-laden forums, risk your personal data, and likely end up with a broken version that crashes during an important presentation.
When searching for license keys online, you will often see websites offering "eShare keygens," "cracks," or "free lifetime licenses." Be extremely cautious.