The most secure "free" move you can make is to migrate your site to a modern version of Joomla. Modern versions of RSForm!Pro are significantly faster, more secure, and GDPR-compliant. Better Alternatives to Nulled Downloads
Look for extensions that were originally released as GPL or Free on the Joomla Extensions Directory (JED). While many have moved to Joomla 3/4/5, some developers keep their old 2.5 versions available for free. rsform pro 140 rev45 for joomla 25 free
If you need a form solution for Joomla 2.5 but don't want to risk a nulled file: The most secure "free" move you can make
If you are still running Joomla 2.5, you are likely maintaining a legacy project. It is important to remember that Joomla 2.5 stopped receiving official security updates in December 2014. While many have moved to Joomla 3/4/5, some
Use a service like Google Forms or Typeform and embed the code via an HTML module. This keeps the "processing" off your old server, reducing security risks. Conclusion
Finding an older, specific version of a Joomla extension like for a legacy system like Joomla 2.5 can be a challenge. While many developers look for "free" versions or "nulled" downloads, there are significant risks and better alternatives to consider for your website's health.
RSForm!Pro has long been considered the "gold standard" for form builders in the Joomla ecosystem. Version 1.40, specifically Revision 45, was a stable release designed during the peak of the Joomla 2.5 and early Joomla 3.x eras.