Dexxter subscription invoice not downloadable

Via the left-hand uRL under settings, I can find ‘subscription’ back, and there is also a line from my current Dexxter subscription. The date appears to be clickable, so I assumed that by clicking on it, I could see the invoice (and then enter it as a purchase invoice). However, it seems to be a dead link; it doesn’t take me anywhere, so I can’t see the actual invoice from my Dexxter subscription. Any advice?