LW4xx zip is actually LW5xx
The uploaded LW4xx Linux.zip is actually a different version of LW5xx. It doesn't contain any LW4xx PPDs and is almost identical to the LW5xx zip:
$ wget https://github.com/dymosoftware/Drivers/raw/main/LW5xx%20Linux%201.4.3/LW5xx%20Linux%201.4.3.zip https://github.com/dymosoftware/Drivers/raw/main/LW4xx%20Linux/LW4xx%20Linux.zip
$ unzip -d LW4xx "LW4xx Linux.zip"
$ unzip -d LW5xx "LW5xx Linux 1.4.3.zip"
$ diff --recursive --ignore-space-change --brief LW4xx/Linux "LW5xx/LW5xx Linux 1.4.3"
Only in LW4xx/Linux: .DS_Store
Files LW4xx/Linux/Makefile.in and LW5xx/LW5xx Linux 1.4.3/Makefile.in differ
Only in LW4xx/Linux/src: .DS_Store
Only in LW4xx/Linux/src/boost/preprocessor: debug
Files LW4xx/Linux/src/lm/tests/TestLabelManagerFilter.cpp and LW5xx/LW5xx Linux 1.4.3/src/lm/tests/TestLabelManagerFilter.cpp differ
Files LW4xx/Linux/src/lw/tests/TestLabelWriterFilter.cpp and LW5xx/LW5xx Linux 1.4.3/src/lw/tests/TestLabelWriterFilter.cpp differ
Did you find a workaround for this? I noticed the same thing, looking for the LW450 .ppd files.
Found here: https://github.com/matthiasbock/dymo-cups-drivers/tree/master/ppd
Any help for windows users? Where can I get 4xx drivers?
They have a monumentally shitty website.
Go here:
https://www.dymo.com/support?cfid=user-guide
Click "Driver and Software Downloads". Expand the top item. Download the Windows version

@dymosoftware please fix the LW4xx Linux.zip!
I downloaded this repo and they're 32-bit drivers, which will never work on Apple Silicon.
I found a third party driver:
sudo apt-get install libcups2-dev libcupsimage2-dev printer-driver-dymo
It works on my LW450 for printing simple text:
printf "lol" | lp -d LabelWriter-450 -o PageSize=30252_Address -o landscape -o cpi=7
Get the parameter names from the Printer Properties in your OS (like 30252_Address is in the dropdown)
If you want to get fancy, it will also print .png images if you render them via imagemagick commands in a script beforehand. I somewhat got a best-fit label printer working this way, but I don't feel like fiddling with it more.
I ended up here after trying these drivers. But in the end sudo apt install printer-driver-dymo was enough for my use case (using a 4XL shared via cups on a RaspberryPi Zero W 1.1)
As of Feb 21st, 2024, the LW4xx drivers are still the LW5xx drivers.
If you are using Ubuntu, the package printer-drivers-dymo contains the drivers for older versions, however, I don't understand why it takes infinite time to print from a RaspberryPi using these drivers. I was hoping I could compile and install.
The LW5xx compiled drivers have a decent responsiveness when printing from a RaspberryPi.