Why were older versions removed from Genymotion?

Last verified against genymotion.com:

Older versions are no longer provided because Genymotion’s infrastructure and Android images keep evolving, so compatibility with old releases cannot be maintained. How can I get old versions of Genymotion Desktop?

Versions before 3.7.0 are also incompatible with current modern Android images and may become unusable soon. How can I get old versions of Genymotion Desktop?