My snap always point out error about java

[marpet]

Regarding sen2cor see this post:

SEN2COR tool

I think there never was a 32bit version of sen2cor. But @umwilm can correct me. Best would be to update your system. A 32Bit system can not manage more than 4GB of RAM. And this is often not sufficient for processing S2 data.

S2TBX module is the Sentinel-2 Toolbox, yes.
and please see here:

SNAP exception errors on update

It could be a workaround to delete the gdal modules manually. They are named: org-esa-s2tbx-s2tbx-gdal-reader.jar and org-esa-s2tbx-s2tbx-gdal-reader-ui.jar You can find them either in C:\Users\USER_NAME\AppData\Roaming\SNAP\modules or on Unix /home/USER_NAME/.snap/system/modules Delete both files. After starting SNAP you will be asked that if you want to disable these modules. Answer yes.

This might be a workaround. Uninstallation of S2TBX is then not necessary.