安装机器学习包caret出现问题？

Warning in install.packages :

  downloaded length 618496 != reported length 2544791

trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/utf8_1.1.4.zip'

Content type 'application/zip' length 214657 bytes (209 KB)

downloaded 209 KB

trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/lava_1.6.5.zip'

Content type 'application/zip' length 2166361 bytes (2.1 MB)

downloaded 2.1 MB

trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/labeling_0.3.zip'

Content type 'application/zip' length 61756 bytes (60 KB)

downloaded 60 KB

trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/munsell_0.5.0.zip'

Content type 'application/zip' length 243371 bytes (237 KB)

downloaded 237 KB

trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/R6_2.4.0.zip'

Content type 'application/zip' length 58343 bytes (56 KB)

downloaded 56 KB

trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/RColorBrewer_1.1-2.zip'

Content type 'application/zip' length 55498 bytes (54 KB)

downloaded 54 KB

trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/cli_1.0.1.zip'

Content type 'application/zip' length 589847 bytes (576 KB)

downloaded 576 KB

trying URL 'https://cran.rstudio.com/bin/windows/contrib/3.5/crayon_1.3.4.zip'

Content type 'application/zip' length 749307 bytes (731 KB)