[Plugin: NextGEN Gallery] Manually updating to 1.8.4

Hi guys.
Today I got the message, that there’s a new version of NGG which solve some security vulnerability.

I’m using version 1.8.3 and added some custom code.
If I’d run the automated update, all that code would be lost.

Does anyone can tell me, which parts of the code I’ve to edit to get rid of those security problems? Something like a manual update on the plugin.

Thx to all in advance ??

https://www.ads-software.com/extend/plugins/nextgen-gallery/