Will the upgrade script proceed if one did not run preupgrade.sql first ?

Hi all,
testing my upgrade from [windows 2003 32bit 10.2.0.5.0] to [windows server 2008r2 64bit 12.1.0.2.0]
it seem that if i did not run the preupgrade.sql on the source database,
the upgrade script seem not able to proceed -> %ORACLE_HOME%/perl/bin/perl catctl.pl -l %ORACLE_HOME%/diagnostics catupgrd.sql
I was checking the log under -> %ORACLE_HOME%\diagnostics\catupgrd*.log
scrolled to the bottom, it mention the "preupgrade.sql has not being run" ERROR....
sorry i couldn't capture the exact error as i have overwritten the catupgrd*.log .
My question is,
if i were to restore from rman tape(10.2.0.5.0 dataflies) to a new host (12.1.0.2.0),
what's the point of running the preupgrade.sql?
Cause i feel that it is not base on the 10.2.0.5.0 .
Or i just need to run it (preupgrade.sql) after i have restore from tape to the new host so that i can con't to proceed with my upgrade process?

Or i just need to run it (preupgrade.sql) after i have restore from tape to the new host so that i can con't to proceed with my upgrade process?
You will not be able to do this since you will not be able to open the 10.2.0.5 database files using the 12.1.0.2 binaries.

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