This sounds like that there is something remaining from the SNAP 3 in the SNAP system directories.
Please try to delete the .snap folder in your user home directory and also the SNAP folder in <USER_HOME>\AppData\Roaming
Followed your suggestion and removed all SNAP-related folders - but still get the same error message.
Tried SNAP 3.0 (removing all SNAP-related folders) - nothing happens after the required resolution is selected.
On which operating system are you working? I assume on windows.
It is possible if you use different SNAP versions side by side that they interfere with each other.
Could you try to open a jp2 file of the product from SNAP?
Could you try to run "opj_dum[.exe] -h (.exe if you are under windows), you can fin the openjpeg executables in the .snap/auxdata/openjpeg/4.0.0 folder of your home directory
the opj_dum[.exe does not appear in the folder stated.
The path is: .snap\auxdata\openjpeg\openjpeg-2.1.0-win32\bin - do not have permission to run this though
When the latest version of SNAP is started the .snap\auxdata\openjpeg\4.0.1 foder is created, with the openjpeg executables inside. Your folder seems to be created by an old version of SNAP. Did you delete the .snap folder of you home directory as @marpet suggested? You might have an access right problem in this directory.
4.0.0 is fine, you would get 4.0.1 if you installed the latest plugin update.
This path was wrong [quote=“rjh55, post:7, topic:2875”]
.snap\auxdata\openjpeg\openjpeg-2.1.0-win32\bin
[/quote]
The issue seems to be related to internet security set-up and where executable files can be run from.
There is a restriction on running executable in the user directories.