Tried several times, no luck - last log entries look like compiler errors (I watched the installer log during the first attempt and all dependencies at the beginning were installed OK with no errors, but the first attempt ended up with the same compiler errors):
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Start installation or upgrade of Guest Tools
installer:%10.000000
installer:%20.000000
Installed Guest Tools were not found
Register service to install new Guest Tools
installer:%30.000000
Perform installation into the /usr/lib/parallels-tools directory
installer:%40.000000
make: Entering directory '/usr/lib/parallels-tools/kmods'
Will use compiler CC="cc".
Compiler version "cc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-18.0.2)"
cd prl_tg/Toolgate/Guest/Linux/prl_tg && make CC=cc
make[1]: Entering directory '/usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg'
1: /lib/modules/5.15.0-3.60.5.1.el8uek.x86_64/build
2: /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg
3: 20230524
4: 1.10.2
Start compile prl_tg...
make -C /lib/modules/5.15.0-3.60.5.1.el8uek.x86_64/build M=/usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg SRCROOT=/usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg CC=cc modules
make[2]: Entering directory '/usr/src/kernels/5.15.0-3.60.5.1.el8uek.x86_64'
warning: the compiler differs from the one used to build the kernel
The kernel was built by: gcc (GCC) 11.2.1 20220127 (Red Hat 11.2.1-9.1.0.2)
You are using: cc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-18.0.2)
1: /lib/modules/5.15.0-3.60.5.1.el8uek.x86_64/build
2: /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg
3: 20230524
4: 1.10.2
CC [M] /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg/prltg.o
cc: error: unrecognized command line option '-ftrivial-auto-var-init=zero'
cc: error: unrecognized command line option '-fzero-call-used-regs=used-gpr'
make[3]: *** [scripts/Makefile.build:288: /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg/prltg.o] Error 1
make[2]: *** [Makefile:1974: /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg] Error 2
make[2]: Leaving directory '/usr/src/kernels/5.15.0-3.60.5.1.el8uek.x86_64'
make[1]: *** [Makefile:44: prl_tg] Error 2
make[1]: Leaving directory '/usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg'
make: *** [Makefile.kmods:49: compile] Error 2
make: Leaving directory '/usr/lib/parallels-tools/kmods'
Error: could not build kernel modules
modprobe: FATAL: Module prl_tg not found in directory /lib/modules/5.15.0-3.60.5.1.el8uek.x86_64
modprobe: FATAL: Module prl_tg not found in directory /lib/modules/5.15.0-3.60.5.1.el8uek.x86_64
Error: failed to install Parallels Guest Tools!
---------------------------------------------------------------------------------------------------------------------------
Start installation or upgrade of Guest Tools
installer:%10.000000
installer:%20.000000
Installed Guest Tools were not found
Register service to install new Guest Tools
installer:%30.000000
Perform installation into the /usr/lib/parallels-tools directory
installer:%40.000000
make: Entering directory '/usr/lib/parallels-tools/kmods'
Will use compiler CC="cc".
Compiler version "cc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-18.0.2)"
cd prl_tg/Toolgate/Guest/Linux/prl_tg && make CC=cc
make[1]: Entering directory '/usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg'
1: /lib/modules/5.15.0-3.60.5.1.el8uek.x86_64/build
2: /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg
3: 20230524
4: 1.10.2
Start compile prl_tg...
make -C /lib/modules/5.15.0-3.60.5.1.el8uek.x86_64/build M=/usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg SRCROOT=/usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg CC=cc modules
make[2]: Entering directory '/usr/src/kernels/5.15.0-3.60.5.1.el8uek.x86_64'
warning: the compiler differs from the one used to build the kernel
The kernel was built by: gcc (GCC) 11.2.1 20220127 (Red Hat 11.2.1-9.1.0.2)
You are using: cc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-18.0.2)
1: /lib/modules/5.15.0-3.60.5.1.el8uek.x86_64/build
2: /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg
3: 20230524
4: 1.10.2
CC [M] /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg/prltg.o
cc: error: unrecognized command line option '-ftrivial-auto-var-init=zero'
cc: error: unrecognized command line option '-fzero-call-used-regs=used-gpr'
make[3]: *** [scripts/Makefile.build:288: /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg/prltg.o] Error 1
make[2]: *** [Makefile:1974: /usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg] Error 2
make[2]: Leaving directory '/usr/src/kernels/5.15.0-3.60.5.1.el8uek.x86_64'
make[1]: *** [Makefile:44: prl_tg] Error 2
make[1]: Leaving directory '/usr/lib/parallels-tools/kmods/prl_tg/Toolgate/Guest/Linux/prl_tg'
make: *** [Makefile.kmods:49: compile] Error 2
make: Leaving directory '/usr/lib/parallels-tools/kmods'
Error: could not build kernel modules
modprobe: FATAL: Module prl_tg not found in directory /lib/modules/5.15.0-3.60.5.1.el8uek.x86_64
modprobe: FATAL: Module prl_tg not found in directory /lib/modules/5.15.0-3.60.5.1.el8uek.x86_64
Error: failed to install Parallels Guest Tools!