When the Quartus Prime software quit unexpectedly window pop ups, you should see an internal error in the "Preview report".
example: Internal Error: Sub-system: PTI, File: /quartus/tsm/pti/pti_tdb_builder.cpp, Line: 1331
You may checkout our Intel FPGA Knowledge Base webpage to check if there is available solution to the respective internal error.
If not, you will need to share us design .qar file to duplicate this error.
As without duplication of the error from our side, it would be hard to find a workaround/solution for internal error issue.
Which Quartus version and OS system that you are using?
I See that the "Path name is too long" and must be less than 260 characters. However, I am using Block Diagram format and
I don't seem to have control of path lengths. Quartus seems to add to these path names.
I am using the Quartus Prime Lite Edition which until now haven't had this problem.
If you can give me directions, I can download my file.
I believed I have answered your question.
With that, I will now transition this thread to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread. Thank you.
p/s: If any answer from the community or Intel support are helpful, please feel free to give Kudos and select the best solution.