Credit values are not equivalent to unique downloads. You can use membership credits to purchase any item on the site, and each product page will display the number of credits required to download the item. You can see that preview below:
For example, our 100 download credits package costs $9.95 USD per month and gives you $13 USD of buying power on the site, which means you're effectively getting a 20% savings when purchasing with credits.
Which credit package should I subscribe to?
We recommend viewing the cost of the membership as a measure of the buying power you will have each month. For example, if you know that you might regularly spend $35-40 a month on Creative Market, you can choose the membership of 300 credits for the cost of $29.95, where you will receive a value of $37.50 per month in credits.