Install the v5.24.2 app on your Mac.
If you are looking for the actual software mentioned in the story, ensure you download from official or verified sources: Official Developer: June Fabrics PdaNet+ Version Note: pdanet 5.24 mac download
Using a decade-old tethering app like PDANet 5.24 comes with risk: Install the v5
: Unlike older versions that relied heavily on USB cables, the 5.24 client is optimized for WiFi Direct, which allows your Mac to connect to your phone's unique hotspot even if standard hotspot features are blocked. The software itself is legal
Legality is nuanced. The software itself is legal. However, using PDANet 5.24 to bypass your mobile carrier’s tethering fee is a violation of your Terms of Service (ToS). Most major carriers (Verizon, AT&T, T-Mobile, Vodafone, etc.) include clauses against "obfuscating data origin."