Some of the latest cPanel updates are not providing "mysqli" as an extension. (Those same cPanel updates are also progressively pushing forward with things that will eventually make your old ZC 1.5.4 unable to run without upgrading.)
In the meantime, you can bypass zc_install's check for "mysqli" by editing one of the zc_install files:
/zc_install/includes/systemChecks.yml (around line 70 depending on the ZC version):
Code:
mysqlExt:
runLevel: always
errorLevel: FAIL
criticalError: true
Make 2 changes to that "mysqlExt:" section: change that FAIL to WARN, and remove the criticalError: true line.
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