Problem with using rclinicaltrials package - r

I wish to use a package called rclinicaltrials, on using install.packages(), I get the following message -
Warning in install.packages :
package ‘rclinicaltrials’ is not available for this version of R
A version of this package for your version of R might be available elsewhere,
see the ideas at
https://cran.r-project.org/doc/manuals/r-patched/R-admin.html#Installing-packages
And after installing, on using library(), I get the message -
Error in library(rclinicaltrials) :
there is no package called ‘rclinicaltrials’
Is there any way of using this package in my version of R? I am using R version 4.1.0 (2021-05-18). Or do I need to install an older version of R?
Thank you

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Here is my code part
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and here is error I get
Warning: unable to access index for repository https://CRAN.R-project.org/package=TTR/src/contrib:
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