How do you patch an encrypted file?
A patch is a small program that change some bytes of code to correct a bug. If the code is encrypted there will be no way to patch the program.
Patches are useful because can be easy downloaded from any site, as a patch only works with the original code you can make the patch public and with free access.
With encrypted software patches are not possible, for any bug correction you must release a full program that can be big, not so easy to download or get and of course you cannot make it public!

Stupidity also evolves!