Need to update my old macbook from os x 10.9.5 mavericks to yosemite

I need to update my old macbook (13'', mid 2010, 2,4 GHz Intel Core 2 Duo, 4 GB 1067 MHz DDR3) from mavericks to yosemite (in order to be able to upgrade it further to other os). But i can't find a way to update it to yosemite since there are no downloads of yosemite in the app store or on apple support available. Even if there is an answer on how to upgrade to yosemite, the provided links do not work anymore.

The macbook is still working perfectly - but since i didn't update it to yosemite im running out of software i can use with os x. It would be grate if a download of yosemite could be provided.