fix VTK-related issues

typo in previous commit

R/VWRfirstrun.R

@@ -156,7 +156,7 @@ VWRfirstrun=function(requirement="any", n_vert=0, promptless=FALSE)
           message('A specific version of the Numpy package (<= 1.26.4) is more stable for analyses, it will now be installed in the Python libraries along with its dependencies.\n')
           #pip instead of install_py as it will use a virtual environment
           system('(pip install numpy==1.26.4 || pip3 install numpy==1.26.4)') #posterior numpy versions break python functions
-          system('(pip install vtk==9.3.1 || pip3 install nvtk==9.3.1)') #latest vtk==9.4.0 causes problems
+          system('(pip install vtk==9.3.1 || pip3 install vtk==9.3.1)') #latest vtk==9.4.0 causes problems
 
           message('Please restart R after Python installation for its environment to be properly detected by reticulate.')