Can't Install from Source on Debian Bookworm

[TechD123]

I installed from the Debian repos and love how versatile the program is with key bindings.

Unrelated Backstory (but maybe someone can help anyway)
I couldn't get autoloading to work after rebooting. At first I assumed it would automatically make the injection persists after I rebooted. I tried using the command
start --device "name" --preset "x"
via a .desktop file with
X-GNOME-Autostart-enabled=true
without success.

I edited the sudoers file to not ask for passwords, which works fine with another program I use:
user ALL = NOPASSWD: /usr/bin/input-remapper-service
user ALL = NOPASSWD: /usr/bin/input-remapper-control

Manually entering that startup command into the terminal produces:

input-remapper-service 1.5.0 https://github.com/sezanzeb/input-remapper
python-evdev 1.6.1
Loaded config from "/home/user/.config/input-remapper/config.json"
ERROR: Is the service already running? (name already exists on the bus)
Stopping all injections

So it appears something is up with input-remapper 1.5.0
I should note that simply opening the GUI and hitting "Apply" works.
The issue promised in the title
I just wanted to report a bug on the above when the issue template suggested downloading from source in order to get the latest version. I had tried this without success before downloading from the debian repos, here's the error:

E: Failed to fetch http://deb.debian.org/debian/pool/main/f/freetype/libfreetype-dev_2.12.1%2bdfsg-5_amd64.deb
404 Not Found [IP: 146.75.122.132 80]
E: Failed to fetch http://deb.debian.org/debian/pool/main/g/gdk-pixbuf/libgdk-pixbuf-2.0-dev_2.42.10%2bdfsg-1%2bb1_amd64.deb 404 Not Found [IP: 146.75.122.132 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

This sounds like my package sources are incorrect, but I can perform system updates and the like without any issues. Tried changing my sources.list to archive.debian.org without success, so I reverted.

If this issue was known and has been fixed in a later version, how can I get the debian package maintainers to update?

Thanks for reading!