Can you do a guide / tutorial how to do that?
Sure!
When you run the script ./install_downloads.sh you will see a list of tasks/commands printed in Terminal that the script carries out. Each line of action will reveal the path and object that was placed. Just follow all of those paths and delete the object/item that was installed. Here are all of the items and paths from my terminal. The first half of each line says what is being installed and the second half says where it's being installed. Just go to where it was installed and delete each item. Make sure to clear kextcache in Terminal after you're done removing all of these items:
sudo kextcache -i /
Then reboot. Make sure that you have a backup USB/Clover setup to boot from just in case. Optimally you will have OpenCore or some other boot system in place and ready to go before hand.
Please let me know if you need any additional clarification.
*Example the first command below installs MaciASL.app to the Applications folder*
installing _downloads/tools/RehabMan-MaciASL-2018-0507/MaciASL.app to /Applications
installing _downloads/tools/RehabMan-patchmatic-2018-0507/patchmatic to /usr/local/bin
installing _downloads/tools/iasl/iasl to /usr/local/bin
installing _downloads/kexts/RehabMan-Atheros-2015-0624/Release/IOath3kfrmwr.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-BacklightFixup-2018-1013/Release/AppleBacklightFixup.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-Battery-2018-1005/Release/ACPIBatteryManager.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-BrcmPatchRAM-2018-0505/Release/BrcmFirmwareRepo.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-BrcmPatchRAM-2018-0505/Release/BrcmNonPatchRAM.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-BrcmPatchRAM-2018-0505/Release/BrcmNonPatchRAM2.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-CodecCommander-2018-1003/Release/CodecCommander.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-FakePCIID-2018-1027/Release/FakePCIID.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-FakePCIID-2018-1027/Release/FakePCIID_Intel_HDMI_Audio.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-FakePCIID-2018-1027/Release/FakePCIID_XHCIMux.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-FakeSMC-2018-0915/FakeSMC.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-FakeSMC-2018-0915/HWMonitor.app to /Applications
installing _downloads/kexts/RehabMan-IntelMausiEthernet-v2-2018-1031/Release/IntelMausiEthernet.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-Poller-2015-1230/Release/ACPIPoller.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-Realtek-Network-v2-2017-0322/Release/RealtekRTL8111.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-USBInjectAll-2018-1108/Release/USBInjectAll.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-Voodoo-2018-1008/Release/VoodooPS2Controller.kext to /Library/Extensions
installing _downloads/kexts/acidanthera-AirportBrcmFixup/AirportBrcmFixup.kext to /Library/Extensions
installing _downloads/kexts/acidanthera-AppleALC/AppleALC.kext to /Library/Extensions
installing _downloads/kexts/acidanthera-BT4LEContiunityFixup/BT4LEContinuityFixup.kext to /Library/Extensions
installing _downloads/kexts/acidanthera-Lilu/Lilu.kext to /Library/Extensions
installing _downloads/kexts/acidanthera-WhateverGreen/WhateverGreen.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-BrcmPatchRAM-2018-0505/Release/BrcmPatchRAM2.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-BrcmPatchRAM-2018-0505/Release/BrcmNonPatchRAM2.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-FakePCIID-2018-1027/Release/FakePCIID.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-FakePCIID-2018-1027/Release/FakePCIID_XHCIMux.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-FakePCIID-2018-1027/Release/FakePCIID.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-FakePCIID-2018-1027/Release/FakePCIID_Intel_HDMI_Audio.kext to /Library/Extensions
installing _downloads/kexts/RehabMan-BacklightFixup-2018-1013/Release/AppleBacklightFixup.kext to /Library/Extensions
installing kexts/HSSDBlockStorage.kext to /Library/Extensions
installing kexts/JMB38X.kext to /Library/Extensions
installing kexts/JMicronATA.kext to /Library/Extensions
installing _tools/kexts/XHCI-unsupported.kext to /Library/Extensions
installing _tools/kexts/SATA-unsupported.kext to /Library/Extensions
installing _tools/kexts/ProBookAtheros.kext to /Library/Extensions