Installer should inform about releases not available due to downgrading of
it should be mentioned that downgrading is not possible if an older release of Plesk is selected with plesk-installer instead of saying there is no release with that ID:
"There is no release with ID 'PLESKxx_x' of product 'plesk' at the installation source."
Thank you for your input. We will consider this functionality in upcoming releases, if it will be popular.
Everyone, please continue voting for this feature if you consider it important.