The Joomla security team no longer fixes core vulnerabilities for this version.
RSForm!Pro is a premier form builder component developed by RSJoomla!. Version 1.4.0 (specifically Revision 45) was optimized for the Joomla 2.5 and early Joomla 3.x ecosystems. Key Features of the Extension
RSForm! Pro is a renowned commercial extension for the Joomla CMS, developed by RSJoomla!. At its peak, it was celebrated as one of the most complex, flexible, and user-friendly form builders available for the platform. rsform pro 140 rev45 for joomla 25 free
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It featured a drag-and-drop grid system to arrange form fields without manual coding. The Joomla security team no longer fixes core
If you are looking for the strongest built-in tools for that specific version: Multi-Page Support
Version 1.4.0 (rev 45) was released around June 2011. It is a legacy version of the software. Current versions have progressed to 3.4.x and beyond. Key Features of the Extension RSForm
If you manage to obtain a verified, clean copy of the extension (though this is nearly impossible from official sources), the installation process for Joomla 2.5 would have been standard: