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This question already has an answer here:

My Nokia Lumia 525 is not updating to Windows 10 Mobile. What is the problem and how can I resolve it?

marked as duplicate by Indrek, Kolappan N, Rowland Shaw Apr 5 '16 at 8:04

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Although Microsoft first planned to upgrade all the Windows Phone 8 devices, they recently stated that only some devices will get the upgrade. Here's the actual list :List of eligible phones for Windows 10 upgrade

Source

Unfortunately, as you can see, the Lumia 525 is not eligible.

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