Reproduction steps:
1. Log in as a user that contains spaces in the name
2. Create a New Project
3. Import the "Trigger.cs" script
4. Check the Editor log to see if the "ScriptUpdater.exe" has run
5. Check if the "ScriptUpdater.exe" path that follows the value "Unity[^\\]+\.dll$" is in quotes
6. Check if the "Trigger.cs" script got updated

Expected Result: ScriptUpdater works for users with spaces/invalid characters in their User Names
Actual Result: ScriptUpdater does not work for users with spaces/invalid characters in their User Names

Reproduced with: 2020.1.0a16, 2019.3.0f3, 2019.2.17f1, 2018.4.15f1, 2017.4.35f1