I just found in the fantastic hp-15c-simulator.de database a .zip file with many programs. I have just put the link to the zip download here below.

https://hp-15c-simulator.de/download#ProgramExamples

This page hosts the best HP15c simulator, that can create program files that can be directly uploaded to your HP15c CE calculator by means of VoyagerSave and Voyager interface, the programs for command-line, Windows and Mac respectively.

I have shown above a part of the folder structure in that zip file. In each of these folders there are several *.15c files, that can be uploaded to the simulator and then create your own memory file to be uploaded to your calculator.

Apparently, Torsten Manz, the author of this fantastic program and website is working on a direct interface with the calculator (not through exporting files to be uploaded, but through direct interface.) Let's stay tuned to it!