Why different update info on two Macs

Hello

I use c1 since some "days".

I use C1 on iMac and MBP.

On iMac always I see an update info when I carry out Search to update... (Nach Update suchen...)
This is not on MBP. Nothing. Always come text like Your C1 is up to date.

Why is it so?

When I ask this to PO I always get answer I can update manually.
I know this.
But this isn't the answer of my question.

Have someone a help?

Regards

Jochen