I want to download gene expression data from ICGC. But most of the data seems to be from TCGA.
Is it your problem description?
TCGA/ICGC do not match raw count expression data
ICGC data ontology
Unfortunately there was no answer.
2 years ago the was the following post in Biostars:
Download ICGC gene expression data
Later there was this post below:
Data retrieval icgc
Don't miss this answer inside:
How to download a whole ICGC release of processed data?
Below is a very recent post:
Accessing controlled cancer data