What do you mean R53?
I found in release notes for R60 next
"When upgrading a SmartCenter Server with the Eventia Reporter Add-on from R56 to NGX (R60), you must upgrade Eventia Reporter Add-on as well."
So upgrade from R56 to Eventia is possible, I think.
From
https://secureknowledge.checkpoint.c....do?id=sk30835 - "There is no direct upgrade path from SmartView Reporter R55 to R56. Custom reports and the data in the reporter database cannot be preserved."
But from R55 to Eventia may be impossible.
In any case check in release notes for NGX section "Eventia Reporter" -> "Installation, Upgrade and Backward Compatibility".
And in this section I found that "Eventia Reporter can be upgraded to NGX (R60) from version NG R56 only. If you are upgrading from a version prior to R56, uninstall the Reporter and continue with the upgrade.Eventia Reporter can be upgraded to NGX (R60) from version NG R56 only. If you are upgrading from a version prior to R56, uninstall the Reporter and continue with the upgrade."