I've been asked to look into using Arnold for Houdini.
Per the Arnold website, HtoA needs to be an exact match in version/build so I've downloaded and installed Houdini 16.5.473 in hopes of installing the relevant version of Arnold.

Just this morning I was running 16.5.378 without issue, but I can't launch 16.5.473.
No errors- splash screen loads- then it just closes.
I've run the license administrator and everything seems to be working (using Indie btw)

I'm downloading 16.5.439 now but in case the issue persists has anyone else had this issue?
Alternatively, does anyone know if Arnold has a version for 16.5.378? Currently on their website I only see HtoA for 16.5.405

Should also mention what hardware/software I'm using!

Windows 10
Lenovo p51
Xeon E3-1505m / 64Gb ram
Quadro M2200

Hi!
I have the same issue… can't open houdini

I was having the same problem. I had to update my houdini.env file to use the correct Redshift plugin build. Seems to work perfectly now.