Hey guys, I've found a way to solve the issue. Though I have very little android development experience, the error seemed like all you had to do was replace any thrustcurve2008 query with a thrustcurve2015 one. So that's what I did, and it fixed it. There are still some other issues with mass components and fin fillets, but with this fix it allows you to run sims.
Instructions:
1) Download oponrocket apk from site
2) Decompile with a tool like APK Easy Tool
3) Search file for "openrocket" to find the folder of queries
4) Open all with something like Notepad++
5) Find and replace all "2008" with "2015"
6) Recompile and put onto phone
Let me know if you have any questions.