Ok, so I solved my problem and want to put this out there because I had a stressful time finding the solution. You want to use MCAselector, which can be found here: https://github.com/Querz/mcaselector. The download for the jar file (which is the one you need) is at the bottom, along with some lackluster instructions. Following the instructions may or may not work and if you are someone with no technical knowledge, you will be lost. For me, I had java through Minecraft, but it would not open MCAselector. Here's how I opened it. Right click anywhere and create a new text document. Name it MCAS_RUN.bat and make sure it doesn't still have the .txt. Make sure it is in the same file destination as your .jar file. Copy the name of the MCAS jar file and then right click and edit the .bat file. Type java -jar and then paste the name of the .jar file (it should look like java -jar mcaselector-1.9.3.jar for instance). That's it! To run the program, simply double click the .bat file and it will automatically run MCAselector. If you are still stuck, I found this tutorial that may help: From this point there are plenty of tutorials on how to use MCAselector. One quick note, I did have java already installed, so if you are having trouble getting the Minecraft version of java to work, just download java here: https://www.java.com/en/.
Hope this helps!