tinytex worked fineon Nov 16, today Nov 19 is not

I have just updated one png file and now, when executing Build Book / bookdown::pdf_book I get the error
Erro: LaTeX failed to compile p03inhata-pdf.tex. See https://yihui.org/tinytex/r/#debugging for debugging tips.
Al�m disso: Warning message:
In system2(..., stdout = if (use_file_stdout()) f1 else FALSE, stderr = f2) :
'"xelatex"' not found
Execu��o interrompida

Exited with status 1.

When I look to the suggested link and execute

update.packages(ask = FALSE, checkBuilt = TRUE)
tinytex::tlmgr_update()

the 2nd command (tinytex::tlmgr_update()) shows an error message:
tlmgr update --all --self
Error in system2("tlmgr", args, ...) : '"tlmgr"' not found

Going forward to the 2nd suggestion
tinytex::reinstall_tinytex()
it reinstalls OK

Going forward to the 3rd suggestion, I do not receive any kind of "verbose" information in order to track the error, the same first error above is presented

I would appreciate a lot how to resolve this. Thank you