Alright guys...what’s the secret to catching a mountain lionfish??

Thank you @kalaksed - I will give the basil a try :) And if all else fails I’ll use that lot!!

Right guys! This worked for me :) So i followed a guid that said to fish for the mountain lion big fish at the waterfall Found in Deep Woods of Granite Falls (Waterfall Spot), But insted i used Endangered Species of fish, My sim is max lvl in fishing and i captured it from the waterfall in the Hermit of Granite Falls :) took a few attempts as i captured one cowplant and 4 sage but it seemed to work! Oh also i captured all the other species of fish before trying for this one (just incase, i did try a few attempts with big fish bait before hand with max lvl fishing and 87% of my fish captured but it didnt seem to work) Capturing rare fish with endagerd fish as bait seemed to work great for me as it only took a few attempts! Try it out, i hope this helps :)

I just build up my sims fishing skill and go to where the hermit lives in Granite Falls and keep fishing.
I always get a Mountain Lion fish after a while.
No cheating required as the only cheat I know is the Motherlode one and I don't use any mods as I don't know how to get them.
I've went onto various mod sites and downloaded stuff but have no idea where they have gone.

@mock68 if you are using the Edge browser in Windows 10 do a Save As and designate where you want the file to be saved. Also if you are using windows do a search for these terms:

• *.zip
  
• *.package
  

this should show you all of those files with that extension and you can discover where those files you downloaded are.

If you are using a Mac, I dunno.