I am used to the conveniences of MMA 11.3 such as: can undo some times, autocomplete codes, and so on, however I have to run some functions in the version 5.2. So I installed Mathematica V11.3 and V5.2 in my PC at the same time. Now I want to know if I can run my old functions through MathKernel 5.2 in the notebook 11.3; If yes, how can it be done? It will be better if one or two practical examples are provided. Thanks.
If you can not find the v5.2, you can demonstrate the process by using v11.3 ,v12, or any other different versions you can find.
BTW, I have read the following links? but they failed to solve my problem.
I needn't interact the results of each other between the two versions, I only want to combine the MathKernel 5.2 and the notebook 11.3 (if possible, you can cut off the MathKernel 11.3)
Not give examples how to make it come true.