Hi @namow,
Do you really need the newest version of igraph package ?
The newest version is 1.2.5, the previous version is 1.2.4.2.
Installing 1.2.4.2 causes no problems.
So with:
install.packages("igraph")
when you see this;
click "No", and you are good to go.
This works for me on Windows 10 x64, R 3.6.2, RStudio v. 1.4.84.
Please let us know the result ?
Best regards.
PS. If you want to see my struggle with installation of packages, read this post:
https://forum.posit.co/t/i-cant-install-dplyr-dev-version-and-rlang-dev-version-on-windows-10/48080