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I need to use an earlier version 3.5 for testing something. I have 3.6. How can I download and install 3.5?

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I need to test a new learning management system used by my university in Firefox 3.5. This browser is certified for Blackboard 9.1 wheras 3.6 is not. I already upgraded to 3.6. How can I download and install 3.5?

I need to test a new learning management system used by my university in Firefox 3.5. This browser is certified for Blackboard 9.1 wheras 3.6 is not. I already upgraded to 3.6. How can I download and install 3.5?

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My advice is to install the Firefox Portable version that you need for Blackboard on your computer, and use that installation only for Blackboard. Continue to use 3.6 for all other web browsing.
FP 3.5.x is here:
http://portableapps.com/apps/internet/firefox_portable/localization#legacy