Unless you know exactly what you need, you are far better off downloading the release files from the Wiki Release Page
WARNING - this directory contains beta releases of tomboy-ng, right now, hopefully, pretty stable ones, very close to where we need to be. Mostly v0.36g - 'g' for "Gee, I hope this works!" ! Firstly, it has a few fixes and a new way to set sync timing, it can copy in plain text and ctrl-shift-Z will also undo. Syncing is now done as a background process so no more unresponsive few seconds while auto syncing. Linux KDE user will notice that they now must use the right click on the tray icon to popup a menu. The 'g' version has some small bug fixes on the 'f' version. But its a beta ! Be very careful.
Qt5 and Qt6 users MUST install a new libqt5pas1 or libqt6pas6 libraries, your distro version is almost certainly not suitable any more. Get the new libraries from the links below and install them before or at the same time as you install tomboy-ng
https://github.com/davidbannon/libqt5pas/releases
https://github.com/davidbannon/libqt6pas/releases
Mac Users - the v0.36g beta for Mac now supports (hopefully) the Apple Silicon, M1 or ARM chip machines with a native code binary (as well as the Intel binary) for the first time, it has 'UNI' (Universal) at the end if the filename. I have built and packaged, tested on x86_64 but not Apple Silicon as I don't have a new Mac. Please try it out and let me know what you find.
As with any beta, if you use it and a have a problem, you should feel obligated to report that problem. Please !
I am sorry just how hard its becoming to find the file you want here !