Let's Encrypt 1.5 for Windows Installation error

I tried installing the new "Let's Encrypt" extension and I'm getting the following error. The obvious issue appears to be the path to the phython.exe, the two slash are making the path invalid. Anyone else tried the new extension?

Error: Failed to install the extension: Executing E:\Program Files (x86)\Parallels\Plesk\admin\plib\modules\letsencrypt\scripts\post-install.php failed: ERROR: The executable "E:\Program Files...

Let's Encrypt 1.5 for Windows Installation error