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If you are updating to 13.1 from an earlier version, this build included several significant enhancements:
: Version 13.1 was the final major release under the "Smile" branding. Most critical bug fixes and improvements (such as resolving crashes with large images and fixing redaction tool issues) are now delivered through the Nitro PDF Pro 13.2+ updates . PDFpen Pro 13.1 fix
: You can use the Nitro Migration Assistant to move your library items, stamps, and user preferences from PDFpen Pro 13.1 to the newer Nitro version. Key Updates from Version 13.1 If you are updating to 13
: If the application is slow or freezing (especially on M1 Macs), users are advised to perform a clean install or launch the app while holding the Shift key to prevent it from reopening previous windows. Key Updates from Version 13
The software previously known as has been rebranded and updated to Nitro PDF Pro following Nitro's acquisition of Smile Software. If you are experiencing issues with version 13.1, the primary "fix" recommended by the developer is migrating to the latest Nitro-branded version. Resolving Issues in PDFpen Pro 13.1