Hello,
You should be able to download free versions of NCH programs from the link below:
https://www.nchsoftware.com/software/free-downloads.html
I do know that free versions will ask you from time to time if you are using the program for non-commercial home use only or for commercial use, if you do not choose the first option or close the message the free version deactivates and it activates the trial version which will then block after a couple of uses or right away.
NCH Software says that as per company policy they do not list the differences between their paid and free versions.