You should be able to use it on your new mac but it'll cost you an activation: read the rules:https://www.mql5.com/en/market/rules#part_IV
17. The number of free Product Activations on different PCs is defined by the Seller. The minimum number of such Activations for each Buyer is 5, including the one used during the purchase. The maximum number is 20.

Rules of Using the Market Service
- www.mql5.com
General Provisions and Conditions of Use service Market

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Hi
I use windows 10 laptop for trading. I am going to switch my MT5 to new MacBook,
after I switched, can I still use my existing purchased indicators on my new MacBook ? or am I need to purchase again?