Which package you get depends on your `add`-history

General Usage
1

Warning for other new users of Julia 0.7. (I never had this problem before.)
I added some packages then finally DataFrames. I got v0.10.0, which did not compile. I removed all packages (rm and gc). Then I added DataFrames again and got v0.13.0, which compiles fine.

2

Did you manage to add all the other packages again without that DataFrames got downgraded to v0.10.0?

3

The resolve will try to pick a package version which is compatible with what you already have installed.

4

The culprit is DataTables. I think I will be fine without that package.

(v0.7) pkg> add DataTables
…
[a93c6f00] ↓ DataFrames v0.13.0 ⇒ v0.10.1