A number of people on here use Researchgate - some for searching for and obtaining copies of papers direct from authors, some to follow particular researchers or projects, and some to post updates of their own work. However, the people running ResearchGate have decided to discontinue the 'Projects' facility. This means that material currently only hosted within a Project will disappear soon.
https://www.researchgate.net/researchgate-updates/retiring-projects