ITAP requires GAP interface to singular [CG12] which is another GAP package. Nowadays, it comes bundled with GAP 4.7+. If your gap installation doesn't have this package you can follow the instructions in [CG12] to install it. To get the newest version of ITAP, download the .zip archive from https://github.com/jayant91089/itap and unpack it using
\texttt{unzip itap-x.zip}
Do this preferably inside the pkg subdirectory of your GAP 4 installation. It creates a subdirectory called itap. This completes the installation of the package. If you do not know the whereabouts of the pkg subdirectory, invoke the following in GAP:
GAPInfo.("RootPaths");
Look for pkg directory inside any of the paths returned. One can then start using ITAP by invoking
gap>
LoadPackage( "itap");
from within GAP. This would automatically load the GAP interface to singular, so you don't have to load it seperately.
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