I cannot install any package after all possible methods.

it seems yes!
You should try with library(data.table) in your example, and it should work just fine :slight_smile:
cheers
Fer

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I've just successfully used the following on MAC under 3.6.2

 install.packages("dplyr", repo = 'https://mac.R-project.org')
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I succeed. Thank you all!

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