@KristofferLislegaard we uplodaed a new disk image for the Organelle M. It is based on the newest Debian version and includes the latest Pd (0.51). You can burn it onto an SD card following the same instructions in the manual.
http://thepeacetreaty.org/organellem/images/image_2021-06-18-organellem-lite.zip
The first time it boots up it takes about a minute because it resizes the file system to match the size of the SD card. This is useful if you burn it onto a large SD card. Previously the disk image was static 8GB even if burned onto a larger card.
We don’t have plans to update the original Organelle right now. It is theoretically possible but would take a bunch of work to get everything up to date. (probably build new disk image from scratch would be the best way).