Updating existing old version

On our old site we are using Affiliates Pro 2.18.1 and Affiliates WooCommerce Integration 1.7.1
Bought in 2017 for 59,-

Now we set up a new DEV site and wanted to update all the plugins but can’t find an downoad for thos plugins.
If going for auto update getting the error “package not available”.

Any advice how to do? 😉

Thanks,
Robert