Use the back up function within the V+ box and record to a DVD recorder (scart from the VCR out on the V+ into the line in on your DVD recorder). Burn a DVD with the DVD recorder (you'll need to finalise the disc as well) and then put it into your Mac. Use a piece of software called 'Mac the Ripper' which will copy the file to your Mac hard drive.
I'd download some free video editing software (Handbrake is a good bet) and convert the DVD file format into your chosen format.
These are basic instructions, but if you buy and download the necessary, I'll talk you through the process in more detail if needs be