If you want to watch "Biyak" without relying on shaky Bilibili links or broken YouTube uploads, here are your current options:
Regal Entertainment released "Biyak" on DVD in 2016. You can occasionally find second-hand copies on shopee.ph or eBay. Search for "Biyak DVD Regal Entertainment." This is the only 100% legal, permanent copy. Biyak Full Movie Bilibili