Bol.com has changed their affiliate network, which means they no longer have XML files.
I have worked on the addon and it does now also accept the TXT files they have for their product feeds. When you add the addon it will give you a settings menu for the Bol.com addon which will look like this:
Here you fill in your Bol Id and it gives an explanation of how you should input the FTP details when you add the feed.
If it can’t import your bol.com product feed. Please send me an email on info @ wpaffiliatefeed . com and attach the 10000 characters you get when you press the Test link on the XML settings screen.