Off topic:Up-grading R 3.2.5 to R 3.4.0

Question

[zizigolu]

Hi,

I was going to install package "proxy" on R 3.2.5 when demanded R 3.4.0 or more. I installed R 3.4.0 but I have > 400 packages installed on my R 3.2.5. How can I tell R 3.4.0 where my packages are not to need to re-installed 400 package on my new R???

Thank you

I am in window 8.0