Hello Morri
what kind of error you get with v7p0 ?
It is so often, and normal, to have non compatible versions of the code. From one version to another some keywords desapears, some others are freshly introduced, call for old routine can be changed, new routines are added.
That's why it is nor recommanded to go back to v6p2 but you need to fix the problem with v7p0, which is, very often, easy to overcome
with my best regards
Riadh