Resetting an OPrint Trial (Windows)
.CONTEXT
Every so often you inherit a small utility that solves a very real problem, but lives in the uncanny valley between “indispensable” and “forgotten.”
OPrint—an AirPrint relay / proxy for Windows—has been one of those tools for me. I’ve had to reinstall it more times than I care to admit while rebuilding or migrating systems, labs, or one-off environments.
This note exists purely because I got tired of rediscovering the same steps.
.DISCLAIMER
This is shared for educational and troubleshooting purposes only. If you rely on a piece of software long-term, pay for it. Developers deserve to eat.
.PROBLEM
OPrint stores its trial state in a small handful of registry keys and a single configuration file. Uninstalling alone does not always reset the trial.
.SOLUTION
To reset the trial period back to 30 days:
- Quit OPrint completely.
-
Delete the following registry keys (including all sub-values):
HKLM\SOFTWARE\Wow6432Node\OPrint HKCU\AppEvents\EventLabels\option -
Delete the following file:
C:\Windows\SysWOW64\config\settingenv - Re-open OPrint.
The application will initialize with a fresh 30-day trial period.
.NOTES
- Administrative privileges are required.
- This has been validated on multiple Windows rebuilds.
- If you do this more than once, automate it responsibly.
.CLOSING
This is one of those tiny bits of operational trivia that never makes it into documentation—but saves real time when you need it.
Future-me: you’re welcome.