How to use older version

[rafaleo]

According to this topic:

https://stackoverflow.com/questions/46101552/cant-set-up-profile-with-latest-version-of-rselenium-for-firefox?noredirect=1

I'd like to know how to apply prefabricated firefox profile to RSelenium driver or, if it's too hard, how to use older version by simply point to the version I need. BTW, which version it was, how to check it? I don't need to downgrade, the new one is ok but not possible to read the profile. Thanks