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Briefly: Update two files in prl_mod.tar.gz, see Parallels forum post "Parallels Tools 15.1.2.47123 Failed to Install on RHEL 8.1"...
Parallels Version 15.1.2 (47123) Install Parallels Tools to RHEL 8.1-1 fails Have also: dnf install gcc kernel-devel-$(uname -r)...