Block Chrome update on Android phone?

When Chrome updated to 60, it broke an app my daughter needs for school. She has dyslexia and uses Learning Ally to read books to her to keep up with her class. I contacted Learning Ally and they said it will not work with Chrome 60 but they are working on it. I tried to switch the default browser to Firefox but it seems to still default to Chrome. My question is if I reset her phone will I be able to block an update to the new version of Chrome? If I go buy a cheap phone can I block updates for Chrome before putting it on wifi? Thanks for any help