I have not found a complete fix it seems all but libraries associated with tidyverse will run and Rmarkdown.
First I did not have Rstudio update my rcompiler version automatically so I went into tools, global options, and changed the version from 3.3.6 to 4.0.4(sic? guess of the top of my head), then I found the 32 bit version of Rstudio was running, updated it to 64 bit,then I ran a batch update of about 60 or so libraries that went through ok, except for tidyverse and related libraries, it is the well troubling namespace exports problem which does not seem to have a one size fits all solution, but a case by case basis, I did run check update libraries which seems to run though it stops on R markdown, more researching needed. It is a very vexing issue as I rely on R for trading for retirement income, and it is critical to get it working ASAP, also crucial Rmetrics libraries are giving strange errors I have not tested whether they work, and it says the fractal library is not available for version 4.0.4? I am literally overwhelmed and have spent ten intense hours already trying to solve unexplainable issues.