Well. about TT Go content, I just checked
In my second mobile phone it is installed, I have mSD card, whole map content is in it, without any adjustment.
I have enough memory both on the card and in the phone.

As for the warning about the new version, we discussed it in topic. It never came out to me, so I don't know what to tell you.
Browse that topic, I think I also installed the p*tched apk directly.