So, on houdini you can’t actually download the version required so heres how to:
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Open up a FTP such as WinSCP
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Make sure you have FTP Chosen and not SFTP
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Enter the credentials:
server: ftp.sidefx.com
username: anonymous or ftp
password: email address
port: standard FTP ports -
Go onto Houdini 18.5
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Find 18.5.532 and download it
Enjoy