Nintendo removed SmileBASIC 4, unable to purchase/find.
It's currently still on the US and Japanese e-shops, so you can get it by making a new Nintendo account for either of those regions and buying it there. The Japanese region also has a free demo, although AFAIK it doesn't support saving so you'd have to type in the exploit code every time. https://www.nintendo.com/us/store/products/smilebasic-4-swit... https://store-jp.nintendo.com/item/software/D70010000010547
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It's currently still on the US and Japanese e-shops, so you can get it by making a new Nintendo account for either of those regions and buying it there. The Japanese region also has a free demo, although AFAIK it doesn't support saving so you'd have to type in the exploit code every time. https://www.nintendo.com/us/store/products/smilebasic-4-swit... https://store-jp.nintendo.com/item/software/D70010000010547