If you uninstall v3.x then the v4.x installer wont be able to find your data folders correctly and it may encounter problems importing your settings and site profiles.
Also the user may need to use the backup feature in v3.x to backup their settings so that they can be imported into v4.x
I've had to deal with a few customers who have ended up deleting their settings and site profiles while uninstalling v3.x so I am suggesting to customers upgrading to v4.x to not uninstall v3.x until they're 100% sure everything is working properly.
Once everything is working and if you no longer need v3.x it would be ok to uninstall it.
Our installer is designed to do upgrade installs, if you uninstall a previous v4.x build before upgrading to a newer v4.x build then you defeat the purpose of upgrade installs and make more work for yourself.
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