not possible to set the "R home directory path" in Bluesky Statistics

I have problems in setting the "R home directory path" with the latest 64bit release of Bluesky Statistics (6.20.7235). After running the software for the first time, I received the following error:

Error: Cannot Launch BlueSky Statistics! Please make sure:

R_HOME configuration variable is pointing to the correct version of R.

Then, I set the "R home directory path" as follows, but I still got the above error: C:/Program Files/BlueSky Statistics/R-3.6.1

I have the same problem when installing also the 32bit latest version, but not with the 64/32 bit stable release (6.10.7107). There are not other versions of R installed in my laptop.

Here are additional information of my laptop: OS: Windows 8 64 bit; CPU: Intel Celeron N2840 2.16 GHz; RAM: 4 GB.