After these 45 days you can't download new product releases (released after your license expiry date). Also you will no longer be able to request support for your instance from support.atlassian.com or via email / phone.
You can find more info here:
After the first 12 months, your software maintenance will expire and you will no longer be able to receive technical support or software updates. Renewing your software maintenance is done purely at your discretion and can be renewed in advance of your maintenance expiration to ensure uninterrupted access to the support and software updates.
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