Would you mind sharing that method? Neither of the two links seem to work for me. Nothing happens when the first song is supposed to start.
Also, it seems I don't even have the option to pick my locale emulator, so that might also be the issue.
Edit: I see you've gotten the download to work. Well, in case you or anyone else still wants to support Tomin, who I honestly think deserves it, I'll leave my guide for doing so below. It's also just a general guide for purchasing things off DLsite. Many forms of payment are accepted, including Visa/Mastercard/etc.
Here's the official product page:
You must be registered to see the links
Make sure to select whatever language you prefer, and if it's not, you can select the globe at the top right to change it. You can also the change the currency to whatever your local currency is. Also at the top right, under the globe, is the "Registration" button. Make a DLsite account if you don't have one already.
Go back to the product page and click "Buy Now" on the right side.
I'm using a example picture here because I've already purchased it, but in the purchase page you'll see on the right side how many points you need to purchase the product. 1 pt = 1 JPY. Click "Use/Purchase" in the "Points" section in the middle. Then at the top click "Purchase points".
Click "For Books" and it'll take you to the For Books site where you can purchase DLsite points. It's essentially a workaround to get around the censorship that the credit card companies have employed. Anyways, select 2,000 pts (that should be enough with the free 15% off coupon DLsite gives you), add it to cart, view cart, and checkout. It'll ask you to login, so click the "Create account" link under "Sign in".
The top two text boxes are for last and first name (you can make a fake one as it doesn't matter). The middle box is for an e-mail and that one needs to be legit. Click the bottom right yellow button to confirm after you're done. Check your e-mail and activate the account. Once you're back on the For Books site, click the top right cart button and proceed to check out with your payment info. After you pay, you'll get an e-mail with the serial code for the points.
Back on the DLsite page, click the "Account" button at the top right and go to "My page". On the left side, under the "Points" section you can click "Input Serial Code" to put in the serial code you got via e-mail. Now you can finally complete your purchase! Click the cart at the top right, check if you have the correct product, and checkout.
Make sure you click the "Use a coupon" link and check for any applicable coupons. There SHOULD be a 15% off coupon at the very least. Select it, accept, and your final price should be updated.
After purchasing it, if you have trouble finding what you purchased, click the top right "Account" button again and go to "My Page" again. On the left side under "Manage Works", click "My Items". It'll take you to another page where you can download your purchases.
That's it! This long explanation seems complicated, but it's really not. I broke down each step as much as I could just in case, but most of it can be figured out with some common sense and Google Translate. Best of luck and if you or anyone else have any other questions, feel free to ask!