Hello @alecfra, Thank you for reaching out to us through our Community Forums! To further troubleshoot this failed installation of v11 and missing installation of v12, kindly download and run our Clean Up utility: http://install.nitropdf.com/support/downloads/cleanup.zip After that, please clear the content of the directory under C:\users\your_username\Appdata\local\temp. For whatever reason, not all temp files automatically remove themselves and is NOT usually caused by Nitro Pro