I was in the same boat last month, desperately trying to find 'The Cursed' without resorting to some random PDF site that looks like it'll give my laptop a virus. After a bit of digging, my advice is to start with the big platforms. Amazon has the Kindle edition, and it's usually part of the Kindle Unlimited subscription if you have that. Audible has the audiobook version, which is narrated really well—the narrator gets the main character's sarcasm perfectly.
Don't overlook libraries! I was surprised to find the ebook available through my local library's OverDrive/Libby app. The waitlist was a couple weeks, but it's free and completely legal. Sometimes serialized fiction apps like Radish or Webnovel license these stories too, though they might use a different title or have it broken into episodes. If you're okay with reading on a phone, that's worth a quick search.
Honestly, I gave up trying to find a free, legal copy and just bought it. For the price of a coffee, it was worth it to have it properly formatted and to know the author actually got paid for their work. The official platforms are the safest bet.