Couldn't copy the product key from the website
There is a known issue with the 'Copy key to clipboard' button on older browsers (it doesn't work).
- Go through the process of obtaining a product key.
- Manually select the product key (select all the text in the grey box on the last page by dragging your cursor through it or double clicking on the text) and press Ctrl-C to copy it.
- Go to MP3 Joiner's product activation window, put the cursor in the product key box and press Ctrl-V to paste.