DOES NOT retains backwards compatibility.
Previously, the AcceptFileTypes defaulted to "*" which meant all files were accepted. Now, by default no files are allowed.
If you have always explicitly set the AcceptFileTypes, then proceed. If not, set this property on your control(s) prior to upgrading.
Previously, the AllowedRoles defaulted to "Registered Users". Now, by default it's set to Super Users or Administrators.
Be sure to set this property according to your needs.
Retains backwards compatibility. Install as you would normally.