The first Gaia data release, Gaia DR1, consisting of astrometry and photometry for over 1 billion sources brighter than magnitude 20.7 in the white-light photometric band G of Gaia. The Gaia Data Processing and Analysis Consortium (DPAC) processed the raw measurements collected with the Gaia instruments during the first 14 months of the mission, and turned these into an astrometric and photometric catalogue.

You can read more detail about GAIA DR1 in the release documentation

You can immediately use the GAIA DR1 data with Skychart by using the VO catalog feature.

Make a chart with a FOV of less than one degree in the area of interest.
Open the Catalog settings.

Click Add in the VO catalog tab and search for GAIA, select the catalog I/337, click Select catalog.

Select the first tab I/337/gaia, enter the default magnitude: 20, click Download catalog.

Make sure the GAIA row is green and click the OK button.
You can return to the screen later to load the data for a new area with a click on the arrow in the Reload column.
Beware that the one degree FOV around M13 take 28 MB of data to download, so do not do it on large area.

I am currently downloading the full catalog data (about 200 GB) and I update this page when I have more detailed instructions to build the catalog with Catgen.
At first I need to make a change to Catgen before it can process this data, so this look not immediately possible with the current Skychart version.