I am getting this error message when I open vascular coverage and try to select an image from my files

>> Vascular_Coverage
Warning: Name is nonexistent or not a directory: Vascular_Coverage_Support_Files
> In path at 109
In addpath at 86
In Vascular_Coverage at 8
Undefined function ‘FrangiFilter2D’ for input arguments of type ‘struct’.
Error in Vascular_Coverage (line 24)
[outIm,whatScale,Direction] = FrangiFilter2D(double(I2), options);


Decompress (unzip) the downloaded program files and run the code from a folder and not from the compressed file.