First, ensure you’re referencing the correct error codes, as you’ve mentioned both Error 304 and Error 303, which are separate issues with different causes and solutions.
Error Code 303: Unable to install the product
Adobe’s Definition:
Error code 303 indicates an installation failure.
Solution (Adobe):
Select Retry to download and install the app again.
Additional Notes:
This often happens due to corrupted files or blocked installation processes.
If you’re using GenP or have modified Adobe services or background processes, ensure that nothing critical is blocked or disabled.
A full reinstall of the CC app may resolve the issue.
Error Code 304: The installation is no longer functional
Adobe’s Definition:
Error code 304 indicates that the installation is no longer functional. If Solution 1 doesn’t resolve the issue, try Solution 2.
Solution 1 (Adobe):
Download and install the latest version of the Creative Cloud desktop app, and try again.
Solution 2 (Adobe):
Install the latest digital certificates manually:
DigiCert High Assurance EV Root CA.zip
DigiCert Trusted Root G4 certificate.zip
After extracting, install these certificates into the Trusted Root Certification Authorities store.
Additional Notes:
This error may also occur if previous patches have corrupted the CC installation or if Adobe services, background processes, or certificate access have been blocked (e.g. via hosts file or firewall edits).
If that’s the case, restore default system behaviour, clean up Adobe entries in the hosts file and firewall, then perform a fresh install.
Additional reasons why Error 303 or 304 may occur:
-
Expired or invalid digital certificates.
-
Interference from security software (antivirus, firewall, etc.).
-
Network issues or proxy/VPN settings blocking downloads.
-
Corrupted installation cache or temporary files.
-
User Account Control (UAC) or permission issues.
-
Conflicts with other software or system components.
-
Corrupted or outdated saved credentials in Windows Credential Manager.
Suggested Additional Troubleshooting Steps:
-
Clear the Creative Cloud cache by deleting the contents of the
AppData%\Adobe\OOBE
folder. -
If present, also clear the
LocalAppData%\Adobe\Creative Cloud
folder. (Note: This folder may not exist on all systems.) -
Temporarily disable antivirus or firewall software and retry the installation.
-
Verify your network connection, and try switching networks or disabling Proxy/VPN settings.
-
Run the installer with Administrator privileges explicitly, even if logged into an Admin account.
-
Ensure Windows Updates are fully installed and your system is up to date.
-
Check for a corrupted user profile as rare profile issues can interfere with app permissions or installs.
-
Check Group Policy restrictions as managed systems may block Adobe installs or services.
-
Check folder and NTFS permissions to ensure
ProgramFiles%
andProgramData%
aren’t restricted. -
Avoid registry cleaner issues as these tools may remove critical Adobe-related entries.
-
Ensure Adobe Desktop Service is running and restart it via
services.msc
if needed.
These issues are covered in the Troubleshoot Section of the guide. Be sure to carefully follow all instructions under CC App Errors.
Steps to try:
-
Restart your computer, as sometimes a simple restart resolves the problem.
-
Undo any background service modifications, especially if you followed Guide #8, revert any changes blocking Adobe processes.
-
Check your hosts file and firewall and ensure no Adobe-related entries are blocking connections.
-
Ensure sufficient free disk space as lack of space can cause silent installation failures.
-
Use the CC App Uninstaller Tool and run as instructed to repair or uninstall the CC app.
-
Restart and repatch using GenP v3.6.9; after repair or uninstall, always restart before reinstalling or patching with GenP v3.6.9 again with Administrator privileges.
-
If issues persist, fully uninstall the CC app, restart, then reinstall and repatch with GenP v3.6.9 using Administrator privileges.
First of all, since you’re using the Monkrus method for Adobe, this issue isn’t related to GenP. We do not provide support for Monkrus versions, as they are only covered here for installation purposes and basic help. If you are encountering problems, your best course of action is to post your issue on the Monkrus website under the app’s own comment section.
Also, why are you using Monkrus versions, which are already prepatched with the same GenP files and methods, and then using GenP on it? This is something that should never be done.
As mentioned in the GenP Wiki, mixing GenP and Monkrus versions is never recommended. Running GenP on a Monkrus installation is something that should never be done as it can lead to problems down the road. GenP allows Adobe to run in its normal, unaltered form, with minimal changes. Monkrus, on the other hand, customises Adobe to work as a standalone app, removing more files in the process. A lot more files are blocked and renamed with a
.bak
extension.To fix this, we recommend starting fresh:
• Use the Acrobat Cleaner Tool to completely uninstall Acrobat.
• Restart your device.
• Reinstall Acrobat using the Monkrus method only.
Do not mix GenP with Monkrus, and never run GenP on Monkrus versions.
If you want to switch to GenP for your installation, you’ll need to completely uninstall all of your Monkrus Adobe app versions first to ensure no remnants are left behind. For this, you can refer to Guide #4 - Full Clean to help ensure that you fully remove the Monkrus installations. Afterward, you can proceed with a fresh GenP install.
Regarding PDF/A, PDF/X, and PDF/E Saving:
Both the GenP and Monkrus methods install all apps using the trials version, which is then patched to simulate a genuine copy. However, Acrobat’s optional features, such as Preflight and the ability to save in PDF/A, PDF/X, or PDF/E formats, are only available with a genuine, fully licensed subscription. These features are not included by default in the trial installation because the trial version is designed to provide only the core functionality of Acrobat, with premium features locked behind a paid license.
In order to access features like Preflight, PDF/A, PDF/X, and PDF/E, a user must either purchase a subscription or go through a custom installation process that enables these optional components. This custom setup isn’t possible with Monkrus versions, as they are stripped-down installers that rely on prepatched GenP files and methods to make the apps work. As these are ready-made all-in-one installers, the installation, patching, and modification process can’t be separated in the Monkrus setup.
If you want access to those features, you would need to install Adobe through GenP. Ensure you uninstall your current Monkrus installation first to avoid issues. Once all of Adobe through Monkrus is fully removed, you can then start a clean Adobe install again using GenP method instead. Then once you have Acrobat installed and patched, you can follow the appropriate steps to enable these features.
Finally, as this issue pertains more to Adobe-specific features, we recommend visiting Adobe’s support pages for more details:
How to Convert PDF to PDF/A.
Using PDF/X and PDF/A.
Print Production Tools Overview.
Preflight Profiles in Acrobat.
You can also search the Adobe Community or the Acrobat Subreddit for similar discussions.