Generally speaking: NO


The Fix Integrity (=EP Ready) Tools in SimPE were Designed with Creators in Mind not Downloaders. As a downloader the best (and safest) Solution is to redownload the Objects.

If you cannot redownload the Files, you still don't have to fix them! Check the Objects in your Game. Find all the Objects/Recolors that don't work anymore, and fix only those.

Important:
The EP-Ready Format is only supposed to be used with Objects and Recolors created with SimPE. Clothes, Floors, Skins, Walls and everything that was either created using a Maxis Tool or downloaded from the official Exchachange should NOT be fixed. In fact, the fix Routines will render those Objects Useless for your Game!

Already fixed Maxis content?
If you did not turn off the Autobackup Feature of SimPE, you can restore your Objects by renaming the .bak files to .package. But the .bak Files only contain the Item before the last save.