Upon trying to install the 4-mic ReSpeaker driver in the new Raspberry Pi 64-bit (Bullseye) release I encountered the following error:
grep: /boot/kernel.img: No such file or directory
gzip: stdin: unexpected end of file
grep: /boot/kernel.img: No such file or directory
gzip: stdin: unexpected end of file
WARNING Your loaded kernel version is 5.10.92
Not matching the updated version .
While the 32-bit version of the bullseye Raspberry Pi OS release does indeed contain the kernel image file in the boot directory, the newly released 64-bit bit doesn’t and therefore the “/boot/kernel.img: No such file or directory” error message is generated while trying to install the new kernel.
Is there a work around for this issue or will SeeedStudio release a new driver install script in the near future? Thanks! 
Edit: I overlooked the following at https://github.com/respeaker/seeed-voicecard which states:
Note If you have 64-bit version of Rasperry Pi OS, use install_arm64.sh script for driver installation.