Hi,
Below link will provide Partner access to Application Hotfixes released by Microsoft.
NAV 2013: till July 2015
NAV 2013: from August 2015 to till date
https://mbs.microsoft.com/customersource/northamerica/NAV/downloads/NAV2013AppHotfixOverview_new
NAV 2013 R2: till July 2015
https://mbs.microsoft.com/customersource/Global/NAV/downloads/hot-fixes/NAV2013R2AppHotfixOverview
NAV 2013 R2: from August 2015 to till date
https://mbs.microsoft.com/customersource/global/NAV/downloads/NAV2013r2AppHotfixOverview_new
NAV 2016: till date
https://mbs.microsoft.com/customersource/Global/NAV/downloads/hot-fixes/NAV2016AppHotfixOverview
Regards,
Manish Mutha