* installing *source* package 'quadprog' ...
** this is package 'quadprog' version '1.5-8'
** package 'quadprog' successfully unpacked and MD5 sums checked
ERROR: cannot remove earlier installation, is it in use?
* removing 'd:/Rcompile/CRANpkg/lib/4.5/quadprog'
* restoring previous 'd:/Rcompile/CRANpkg/lib/4.5/quadprog'
Warning in file.copy(lp, dirname(pkgdir), recursive = TRUE, copy.date = TRUE) :
  problem copying d:\Rcompile\CRANpkg\lib\4.5\00LOCK-quadprog\quadprog\libs\x64\quadprog.dll to d:\Rcompile\CRANpkg\lib\4.5\quadprog\libs\x64\quadprog.dll: Permission denied