Updating content with install manager will not work, as you don't have the software or content bought and connected to your DAZ account that Install manager uses to download content.
I would recommend to not use pirated content and connect to DAZ servers with install manager, ever.
In other words, don't use IM at all, install all content manually by copying the files and folders.
If you have time, you could also sort the content when you do it into the folders you want. It will save you time later on as you at some point will have to sort your content archive, either the raw archive or inside DAZ.
Because as we all know the content creators all put their shit in the most stupid hard to find places and under stupid folder names.