R Studio 3.5 errors and Reverting to previous version 3.3

Firstly, just to clarify the distinction between R and RStudio (Differentiating R from RStudio)

When do these errors appear? And what version of R appears when you open just R-application (not RStudio)?

Sometimes, system information is helpful too:

Some system Information could be useful as well

#### System Information:
- RStudio Edition: (Desktop or Server)
- RStudio Version: 
- OS Version: 
- R Version: 

#### Also:
<!-- Depending on your issue, the following may be useful /-->
<!-- If a section isn't relevant or you can't collect it just delete that section below /-->
- RStudio diagnostics report: <!--see rstd.io/support-diagnostics-report /-->
- Your `sessionInfo()`:
- RStudio crash report: <!-- rstd.io/support-crash-report /-->
- RStudio application log files: <!-- rstd.io/support-ide-log-files /-->

The first suggestion I'd make is to