Unable to install on Rpi 4b

[4trir]

Hi, I am new to this and I am encounter an error. When I try to install like show in the PDF manual on my Raspberry Pi 4b, I get the error that ./sdrpp_debian_armf.deb is an unsupported file. I am extracting the package from the git but it still retains the "bullseye" in its name. I also tried a git clone and install that way but am getting a cmake error for "-OPT_BUILD_RTL_SDR_SOURCE". Any help would be appreciated.