when I look at your account, I see only 3 projects, but 607 research items. Do you want to download the research items or the projects?
How to download the projects is described here: https://explore.researchgate.net/display/support/Projects. When you download those, you receive e.g. an HTML file where all items in the project are linked.
I can't really find an option to download all research items at once.
Unfortunately, there is not option in RG to export a list of publications or to download a bundle of files. However, I am sure that all your papers will be kept in your profile. . See also the replies by Joseph C Lee and myself to this question: https://www.researchgate.net/post/You_are_removing_projects_but_will_the_published_research_remain_on_ResearchGate
I very regret about the decision to retire projects in RG. This was a good possibility to order publications by subjects, to inform the community about the progress of own long-term projects, and to get informed about the progress of projects of other researchers. - You may try to contact RG's support team at https://www.researchgate.net/contact. If many users complain, perhaps the decision will be revised. I have sent my opinion to them.
I received the following reply from a member of the ResearchGate Community Support concerning my expression of regrets about the retirement of projects: "While we understand your feelings regarding this decision, we are aiming to provide a better experience for researchers like yourself to showcase your work and stay up to date. To that end, we plan to release multiple features this year to make it easier to share updates, discover new research, and engage with topics. We hope you will join us as we continue to make ResearchGate a more useful tool for all researchers."