For those with the same issue.
Even with the error message, the remove.bat file is generated.
Open it and replace manually (I used notepad++ to replace the file):
P.E, my file was writing the lines like this:
rem Microsoft SQL Server System CLR Types
Product code:{C3F6F200-6D7B-4879-B9EE-700C0CE1FCDA}"
On my case I had to replace the Product code: to msiexec /x "
In order to have the code formatted correctly, like this:
rem Microsoft SQL Server System CLR Types
msiexec /x "{C3F6F200-6D7B-4879-B9EE-700C0CE1FCDA}"
Now that you formatted everything, just run as admin and it should work well.