The signature of installer.msi is corrupt or invalid

This is a known issue when downloading our installers on Windows 10. You should find that the files have in fact been downloaded and that you can still execute them.

If needed the following workarounds may help:

1. Turn off the SmartScreen filter temporarily in Control Panel under Security as described here.
2. Add the site from which you download the .msi file as a trusted site in your internet options

If none of the above helps please raise a support ticket via the "Submit a request" link above.