If you are using Windows 10 Pro Verision 20H2
You have to move you env.file from
C:\Users\YOUR_NAME\Documents\houdini18.5
to
C:\Users\YOUR_NAME\OneDrive\Documents\houdini18.5
Are you sure you are using the right version?
htoa-5.3.0_r233605f_houdini-18.0.499
htoa-5.5.0.1_r45f2926_houdini-18.5.408
Your env is a mix of the 2
“htoa-5.5.0.1_r45f2926_houdini-18.0.499”
How do you start Houdini? Don't double click a hip file. Start Houdini from the Houdini Command Line Tools.
Does anything about Arnold show up anywhere? Did you see anything logged in the Houdini Console at startup?
it shows something like this
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