Unable to load DLL during data transfer

From Zenitel Wiki

After installing AlphaPro on a new computer for the first time this message might appear when attempting Get All, Send All or Send Change:

AP Error DLL1.jpg AP Error DLL2.jpg

The reason is a missing C++ library in windows. It can be downloaded and installed manually.
If you have a 64 bit PC, both the 32 bit and the 64 bit version must be installed.