Been on the forum for a good while now and before I say anything, this is NOT a WSO bashing thread. However, there is something that all buyers AND sellers need to be very aware of.
This may have been stated elsewhere, nevertheless ...I'm going to state it here again.
I've made an awesome living using advice from this forum (both public and paid) so I'm not coming at this from an 'angry person' angle.
I've bought a few WSO's over the last 3 years, and usually I discard the ones which are crappy (yes, they do exist) and kept the ones that valuable to me. In fact, I keep them bookmarked so I can refer back to them sometimes.
It's been a while since I've looked at some of these great WSO's, but when I did a handful of them have been taken down. Meaning, the 'login' pages are not there. Even if I go to my original WSO receipt, the links doesn't exist anymore.
Now I'm NOT here to name and shame authors. Personally, it will only haunt their future business if they continue like that. But what I WILL say is: Sellers, please keep your products accessible to those people who have paid for it.
It's unfair to take things down on a whim because it's simply 'old'. Also, even if you HAVE sent out an email, know that certain customers will not be on that list anymore. It's your responsibility to redirect them to the login page, and then instruct them to use that URL in the future. (tip: this is a nice way to re-ignite the flame and perhaps get them on another list).
Now for the buyers: To be honest, it's not your job to make sure what you paid for is always there. However, in the interest of keeping your WSO (especially the ones which actually have information that you could put to use) I would download the product to your computer.
Yes, thus means pdf's, video's, audio's, etc. Make sure they are on your own hard drive so you can go back to it in a couple of years time if you have to.
Again, no hard feelings to any WSO author in particular here (and if you are one of these authors, I suggest you rectify this immediately) ...but do realize that just because you may have moved domain names, or changed hosting, - or just didn't care about your product anymore, there are others who do.
EDIT: In this post I am mainly referring to WSO's that have an online portal, with a login of some kind. This type of WSO typically leads into several modules, with a lot of video content and perhaps even some pdf's and other accompanying resources. This is where I feel it's totally the sellers responsibility to have it up there always, unless he states he's/she's talking it down or moving it elsewhere.
Stuff like one single ebook, or a couple PDF's - that is no big deal. The instructions to download are usually there. However, products with lots of organized video content, and then not telling your customer to download it is a mistake. Make it easy for them (and tell them to download) in case that portal is not around in a couple of years.