I will get back to why i said "ruin my enthusiasm", but before that I want to state I am/have written this post for people who are either visual or from non-technology related profile.
So every time a new software is released, we tend to have an enthusiasm the take advantage of the new features, performance and security threat fixes being applied.
I will take the example of Firefox since firefox is the most widely used web browsing software around the world. Firefox has also evolved over a long period of time. So the software development team at Mozilla firefox continued the tradition of making it better to best suit the user experience and current trends.
In this period of evolution, they not just added new features they also got rid of some old features, interface. Now its the nature of people to criticise the change and I often see on discussion of new software releases people saying "why they took out that I have been using it for a long time" or " I really liked the old style and look" bla bla...
But here is the deal and whole dearth of this post, You do not have to lose the old software version, Just an extra bit of effort in being aware of what you are doing can help you keep the copy of old installed version of software and parallel install the new copy, Some softwares have this features built in so users usually don't have the problem switching back to old style, or ease of use to what they were addicted to. But like in case of firefox if you click the "Check for Updates" if the update is found the button appears update to version 32RC4 in this case it will overwrite the older version. In such cases or other softwares like this, you can download a redistributable version and carefully install the new version parallel without losing the old one.
I hope you find this article useful.