I received a message about deleting my archive, postings, and papers.
You may try to contact RG's support team at https://www.researchgate.net/contact . Or do you mean the recent message about deleting projects? In this case, see 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 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."
if you mean the discontinuation of the project feature, you may also wish to look at the link below for some further tips in addition to those given in the other answers to the present question:
https://www.researchgate.net/post/The_end_of_Researchgate_projects_what_to_do
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