Hey @dipro,
Thanks very much for the reply. I had come to that conclusion myself, after some googling. I’m building on a Windows machine, but apparently there is an nvm-windows app to do the job of switching between versions. (And I was intending to try version 14, but I’ll have to see what options nvm offers, and it’s certainly good to know a version that definitely works.
I haven’t tried it yet because I’ve been battling with other issues. I’ve left things far too late for comfort with regard to the current devpost contest deadline, and I’ve been battling with the release build process, having thus far only ever run my app locally via ngrok. I seem to be making progress, but it’s going to be a close-run thing… 
P.S. I posted another question which relates to my attempts to get my app finished.-
I’d be grateful if you can offer any thoughts.
Cheers.