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With modernization growing up every day, technological development seems to be at its peak. One such is the Portable Document Format (PDF). Developed in the 1990s, PDF came into existence as a read-only file format that could maintain a fixed format. The very basic reason for this remained in the fact that a secured sharing of documents from one to another computer was very difficult earlier. In the years that succeeded, PDF seems to have become one of the most popular document formats all across the globe. Be it a book or a document, PDF is valued among all peoples.

Advantages of PDF

To elaborate, the countless boons this file format has given us over time; are:

• The format is accepted all across the globe and can be displayed around the world. (not restricted to geographical barriers).
• PDF Files can be created with the aid of diverse security features. Thus, they can be password protected.
• Moreover, the owner of the PDF content can either permit or disallow a person at his/her will and hence the owner has control over his/her content.
• Irrespective of what operating system you work on, (PC, Mac, iOS, Android; etc.), PDF works on all systems.
• PDF files carry a large amount of information in minimum file size with integrated graphics, statistics, etc.
• PDF files, when compared with other formats; have smaller file sizes, and hence much space is saved in the system.

Although this format has given the world many boons, its usage is not exempt from errors that affects multiple user’s actions like file accessibility downloading, printing, or editing, etc. owing to multiple reasons as follows:

• Incomplete update installation
• Third-party applications interference
• Virus and bugs
• Incomplete download from browser
• Browser incompatibility
• Wrong Windows registry settings
• System shutdown when PDF was in use

Let us look at the errors which create huddles while working with PDF files. Also, let us seek out ways to solve these errors to use PDF with ease.

Errors and Solution Pertaining to PDF Usage

“PDF document is damaged and cannot be repaired”

PDF has two new or updated versions namely 10.1.5 and 11.0.1. Each of these versions has enhanced its security by a very rigid parsing of the PDF-header. These new updates do not permit the opening of even a small fraction of the PDF files which do not begin with a %PDF header. This causes “PDF document is damaged and cannot be repaired” error message to crop up.

Solution:
In case the PDF document or file fails to open stating that it ‘is damaged and cannot be repaired’, you could follow these steps:

• If you are using PDF Creators (software that automatically creates PDF files), make sure you modify the method under which the PDF is created.
• Finally, in case you are an enterprise IT professional or a customer, disable the header validation on your respective systems by setting the proper preference(s). And you can do that through HKCU per user and HKLM for all users at the machine level.

“Adobe Reader Update Failed Error 1635”

While trying to update the Acrobat, you might receive an update error which might read as “1635” This patch package could not be opened. Verify that the patch package exists and that you can access it.” Or the message: “contact the application vendor to verify that it is a valid Windows Installer patch package.” Such an error might occur if you have made some significant changes to the computer right before this issue appeared. Another important reason being Corruption. In case of Corruption, the metadata issues in the PDF file occur, (especially while the original document is being generated, scanned, etc.) As a result of the metadata problems, an invalid PDF file is produced and hence the above Error messages! The error occurs usually when you try updating an old Acrobat version to a higher version.

Solution:
Solution 1- To undo this error, do the following:

1. Uninstall your Adobe Reader from the windows.
2. Go to the ‘Adobe Readers Download’ page.
3. Click ‘Download Now’ to download Adobe Reader again.
4. Permit the Download Manager with ample time to download the files necessary for installation.
5. Follow the prompts and install Reader.

This should rectify the error but if it doesn’t try using a different web browser.
Solution 2- As has already been said, the error crops up when you try to update Acrobat to newer or higher versions. You could use these steps to correct the error:
Step – 1: click on the Start button. Type ‘Run’ on the box with “Search programs and files”.

Step – 2: Click on Run. On the Wizard that appears, type ‘Regedit’. Click Ok.

Step – 3: On the ‘Registry Editor’, select the appropriate registry key and then remove it:

For Retail, Volume as well as Tryout versions of Acrobat 8.x Professional

• HKEY_LOCAL_MACHINE\Software\Classes\Installer\Products\68AB67CA330100007706000000000030
  For Retail version of Acrobat 8.x Standard:
• HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\Adobe Acrobat 8 Standard
• HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall\{AC76BA86-1033-0000-BA7E-000000000003}
• HKEY_CLASSES_ROOT\Installer\Features\68AB67CA33010000ABE7000000000030

For Reader 8.0.0:

• HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Features\68AB67CA7DA73301B7448A0000000020
• HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\68AB67CA7DA73301B7448A0000000020
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-518\Products\68AB67CA7DA73301B7448A0000000020
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{AC76BA86-7AD7-1033-7B44-A80000000002}
• HKEY_LOCAL_MACHINE\SOFTWARE\Adobe\Adobe Reader

Step – 4: Choose Edit and then select ‘Delete’.

Step – 5: A ‘Confirm Key Delete’ wizard appears. Click ‘Yes’.

Step – 6: Repeat Steps 3-5 on the other/remaining registry keys.

Step – 7: Exit Registry Editor.

“404 Page Loading Error” & “Failed to Load”

The 404 Page Loading Error is usually observed when the PDF file is either removed or moved leaving the URL unchanged. Simply speaking, the page (here the PDF file) does not exist with its present URL.

The Failed to Load error usually occurs when you try opening a PDF File on Chrome browser alone. A pectoral description of the Error is given here below:

Solution:
Since this occurs when you use Google Chrome, change the browser to either Internet Explorer or Firefox.
There are as many solutions as there are errors in the usage of PDF, explaining which would require yet more time and space. But if the above solutions don’t work out well for you, Kernel has a PDF repair tool that provides a simple way to repair Adobe PDF files.

Kernel for PDF Repair – Features

Some of its features, which make Kernel for PDF Repair Tool indispensable in cases of PDF-errors are provided for your reference:

• Kernel for PDF Repair possesses the capability of repairing multiple PDF files in a single Repair cycle.
• The Tool maintains complete properties as well as the structure of the PDF file it treats.
• The texts, data, images, graphs etc. present on a particular PDF file that is being repaired by the Tool, are accurately recovered.
• The hyperlinks, contacts as well as notes are restored intact.
• The repair tool supports all-sized PDF files from all versions.
• Files stored on external storage devices are also repaired efficiently.
• The PDF file formatting (header, footer, font size, page layout, etc.) is kept intact.

Worried about PDF Errors? Research and try out the DIY steps or get yourself Kernel for PDF Repair for instant results to access PDF files again.

Conclusion
PDF files, though very advantageous for security purposes are vulnerable to corruption due to browser issues, wrong registry settings, recent updates, links removal, application malfunction, etc., and can result in multiple different errors which are very common for users. We have tried to fix some most frequent PDF errors through native solutions. But as manual ways to repair PDF files are unreliable, a professional PDF Repair solution stands at the top level as r the complete solution.