The installer information on the recovery server is damaged [duplicate]

Im trying to reinstall macOs Sierra but get

In the log I only get

Any help appreciated!

You need to restart the Mac and keep holding ⌘+R, and you will get the Internet Recovery screen. Connect to WiFi or via Ethernet and you will be to reinstall the OS.

A couple things to watch on machines that have been off for a while:

• check the date and time, if they are not within 4 minutes of reality, the check for valid software can fail.
• Be very clear if your macOS installer was downloaded a while back, the signing certifications can be expired.
• Be aware that even an unexpired certificate can fail to install if there are errors in the network or disk.