I have added the default value setting of m_DownloadEstimation in indi_toupbase.cpp
from line 2063 you shoud find this code
HRESULT rc = FP(put_Roi(m_CameraHandle, x, y, w, h));
LOGF_ERROR("Error setting camera ROI: %d", rc);
I have added this line.
m_DownloadEstimation = 10000.0; // set Download Estimation to default value --> this value will be adapted when the next frame was downloaded