The colloc.php script needs the Google spreadsheet exported as a .tsv file. You can use directly a local .tsv file or retrieve the Google spreadsheet exporting URL path.
To get the exporting to .tsv URL just open the spreadsheet and select "File" > "Download as" > "Tab-spearated values (.tsv)". Your browser will download then the document. Then open the downloads manager and copy the download link from it.
Select File > Save as... Then in file type select Text CSV. This means "Comma separated Values"
Then select as Field delimiter Tabs
