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high sierra – “Failed to open OSinstaller” on re-install MacOS

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Running into a problem that says “Installer information on the recovery server is damaged” when trying to re-install MacOS (Sierra) on Macbook Air 2017. Most tutorials/”fixes” on Youtube/the internet tell me to change my system’s date to like 2018, which doesn’t fix anything..

The exact error in the install log tells me the following:

Failed to open OSInstaller because the installer is not trusted: Error Domain=PKProductErrorDomain Code=0 "(null)" UserInfo={PKTrustlLevel=3, NSUnderlyingError=0x7f9d65522950 {Error Domain=NSOSStatusErrorDomain Code=-2147409654 "CSSMERR_TP_CERT_EXPIRED" UserInfo={SecTrustResult=5, PKTrustLevel=PKTrustLevelExpiredCertificate, NSLocalizedFailureReason=CSSMERR_TP_CERT_EXPIRED}}}

If anyone has experience with this or an idea how to fix this, please let me know.

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