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It depends on KoolReport packages you use. The koolreport/core and some other packages can work with PHP 7.3.x but there are other packages which require newer version of PHP. Thus, KoolReport Pro version 6.5.0 which includes all the packages, can not be installed with PHP 7.3.x. You would need to either upgrade PHP or use older versions of KoolReport Pro or install only selected packages which are compatible with PHP 7.3.
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