To find your order number you can do the following:
- Go to https://assetstore.unity.com/ and sign into your Asset Store account if you're not already signed in.
- Click the profile icon in the top-right and select My Assets.
- Find Easy Save in this list and note down the date next to Purchased date.
- Click the profile icon in the top-right again but this time select Order History
- Find the order with the same date as your Easy Save purchased date and click View Order Details.
- You can find the Order Number at the top-left (you don't need to include the #).
- When logged into the forums, click your profile in the top-right corner and select User Control Panel.
- Select the 'Profile' tab at the top.
- Enter your Order Number into the Asset Store Invoice Number or Order ID field and then press Submit.