Problem:

E:UTILSMiddleware_10.3.5utilsbsu>bsu.cmd -prod_dir=E:/UTILS/Middleware_10.3.5/wlserver_10.3 -patchlist=L5TD -verbose -install -log=E:/UTILS/error.txt

Encountered unrecognized patch ID: L5TD

Solution:

To fix this

Rename the file patch-catalog_15563.xml as patch-catalog.xml in the cache_dir.

It worked after that.