@lakotaubp Thank you for your reply.
I was able to reinstall OpenStore easily using the instructions from https://open-store.io/about
and I was hoping to avoid the reflash so I will try your toggle suggestion and switch to the dev channel and reflash as a last resort. Cheers.

Hi, I have been running UT on Nexus 5 for some months as my main phone. A while ago, OpenStore stopped working and I have been having trouble with MMS. I thought reinstalling both apps would be a solution. I have already removed OpenStore and I cannot figure out how to get it back. Q1: can you help me reinstall OpenStore? Q2: Can I reinstall the messaging app?