For professional instruments used by professionals, its extremely important that you can always go back to a previous version.

The way software works its near impossible to create anything totally bugfree, users allways can create a situation, programmers never tought of, and so was never tested in a beta.

Now software upgrades are extremely important, in our world. But when you install something that doesn’t work as intended, you allways should be able to move back to the version that worked for you, till the bug thta came with the bugfix is repaired.