I am currently on a Macbook Pro with rEFInd. I am attempting to install a second is, but the installer is giving me problems. One of the suggestions was using ACPI=off, but I am not sure if that is the correct command or where I would input it. It'll only be temporary. Thanks in advance.
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Many BIOSes and EFIs provide ACPI options, but AFAIK there's no way to set such options on Apple's EFI implementations. Thus, your best bet may be to do it in the OS you're trying to install, but the details of how to do this depend on the OS. Most Linux distributions enable you to set ACPI to "off" via a boot option; for instance, see this page for installing Ubuntu in this way:
This example might or might not be helpful, though. You don't say what OS you're trying to install -- a Linux distribution (which one?), Windows, FreeBSD, etc. I just picked an Ubuntu example because Linux is a common choice for dual-booting with macOS, Ubuntu is a popular Linux distribution, and I'm familiar with Linux in general and Ubuntu in particular. If you're installing Windows or something else, then the solution is likely to be different.
Unless you're installing an OS that uses rEFInd to boot its installation medium, rEFInd doesn't really come into play until later. If you install a Linux distribution, and can successfully boot it once using GRUB 2 (or some other mechanism), then installing rEFInd from within Linux, or running mkrlconf within Linux, will pick up the working kernel options and put them in /boot/refind_linux.conf, where rEFInd will detect them.
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I am currently on a Macbook Pro with rEFInd. I am attempting to install a second is, but the installer is giving me problems. One of the suggestions was using ACPI=off, but I am not sure if that is the correct command or where I would input it. It'll only be temporary. Thanks in advance.
Many BIOSes and EFIs provide ACPI options, but AFAIK there's no way to set such options on Apple's EFI implementations. Thus, your best bet may be to do it in the OS you're trying to install, but the details of how to do this depend on the OS. Most Linux distributions enable you to set ACPI to "off" via a boot option; for instance, see this page for installing Ubuntu in this way:
https://linuxconfig.org/set-acpi-off-kernel-parameters-for-ubuntu-linux-installation
This example might or might not be helpful, though. You don't say what OS you're trying to install -- a Linux distribution (which one?), Windows, FreeBSD, etc. I just picked an Ubuntu example because Linux is a common choice for dual-booting with macOS, Ubuntu is a popular Linux distribution, and I'm familiar with Linux in general and Ubuntu in particular. If you're installing Windows or something else, then the solution is likely to be different.
Unless you're installing an OS that uses rEFInd to boot its installation medium, rEFInd doesn't really come into play until later. If you install a Linux distribution, and can successfully boot it once using GRUB 2 (or some other mechanism), then installing rEFInd from within Linux, or running
mkrlconfwithin Linux, will pick up the working kernel options and put them in/boot/refind_linux.conf, where rEFInd will detect them.