MATLAB: How to install 2019a Navigation Toolbox

MATLABnavigationNavigation Toolboxoldertoolboxupgradeversion

Hello,
I'm currently using R2019a. I need to install the Navigation toolbox for an assingment, but the only version available is 2020a. Upgrading to newest version of Matlab will take many days on my internet and I have a deadline. How can I find 2019a Navigation Toolbox?
Regards
Brant
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