AceRoutine library with MKR GSM 1400

I'm trying to use the AceRoutine library with MKR GSM 1400, but it's not supported because my core version is >= 1.8.10 (#error SAMD21 with arduino:samd >= 1.8.10 not supported, it's explained why here) is there a way to downgrade my core version to be compatible with the library?

Never mind I figured it out, just go to board manager and choose older core version...

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