Need ISO Download for 10.13.66-6

I have been tasked with upgrading an old FreePBX system. I plan to set up a system running the same version and import the config then step trough the upgrade process.
The system has no access to the internet.
I have not been able to find any version of FreePBX 10.13.66-6.

I have looked through these and can not see 10.13.66-6 the oldest I see is 10.13.66-12.
I have tried the 10.13.66 and it installs as 10.13.66-17.

Those are minor versions and can be ignored. As far as backup and restore it only cares about the FreePBX version.

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