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You can also use third-party apps like PDF Expert (image to PDF conversion is a Pro feature)
Step 2: In the Categories list on the left, select Security (Enhanced)Step 3: In the Categories on the left, click Security (Enhanced) and the Sandbox Protections section, uncheck the Enable Protected Mode at startup
Click Yes in the pop-up window, then OK and restart AdobeDisable Adobe protected mode Please note that while this method may fix the "PDF not opening" error, it also dispenses with the protections put in place by the developer to ensure your computer isn't infected with malicious codeMethod 2: Install the latest version of Adobe Acrobat An old version of Adobe Acrobat cannot open PDF files created using newer versions
You need to update your Adobe Acrobat Reader to the latest versionTo perform an update, follow the steps below: Step 1: Click Help and scroll down to Check for Updates
Step 2: Click Check for Updates and wait for the application to connect to the Adobe server
Step 3: After a few minutes, the update is downloaded and installedLike PDF, the XPS file format is also frequently used for final documents that need to be shared
Examples are contracts, financial reports, tax returns, resumes, flyers, and other legal documentsIf you want a less expensive file format that’s compatible with Microsoft Office, consider using XPS instead of PDF
If you have Microsoft Office 2010 or newer, you can already open a PDF file directly in Microsoft Word and export it to XPS formatFollow these steps: Open Microsoft Word, and then go to File > Open
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Source:pdf merger