Do you have your /home on a separate partition, or is it all one partition.
If /home is on its own partition, then you can just install the new version over the old one. Just make RHEL use the same partition for /home and do not format it. I suggest that you backup important data first.
If /home is not on a separate partition, then I think you are better off backing up your data and then installing RHEL. Create a partition for /home, and then start again from scratch.
I hope this helps
--Ian
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