I can't downgrade my ImageJ

I’m trying to use the version 1.43 of ImageJ, but I can’t downgrade to that, the latest version witch I can do it is 1.48. How can I downgrade to 1.43?

You can downgrade the ImageJ version manually.

Use one of the older ij.jar from here

Download, rename and store the ij.jar in your ImageJ directory.