As your site is currently Concrete5 version 5.6.3.1 and there have never been any releases with 1.7 in them (from looking at the legacy download list), I assume you are talking about an addon but you haven't specified which one.

More info is required.

Hi goodnightfirefly,
Yes they might have been addons. I just hit the button to install I believe. They ranged from 1.7 to 3.0 I believe. Does that help?

Go to Dashboard > Extend concrete5, and find any addons which match your '3' version number.

The solution may depend on which addon it is.

For the past 4 years I have used Flexcrete for my website - Brad Fogelstrom who designed Flexcrete (Formerly Growthcurve, now Pine Creative Labs). I have mentioned 6 months ago that I updated a version on my site and consequently my website has had all the content and images down ever since. I have contacted Brad multiple times by email and telephone and he has been completely unresponsive. This has been extremely frustrating. I have not been able to get him to roll back the undate installation or email me the zip/archive of the earlier version so that my IT guy here in New Zealand can try to reinstall it. What can I do? Thanks Dan

@danimal

Have you created a support ticket?
http://www.concrete5.org/marketplace/themes/flexcrete/support/...

If the developer is not responding to support requests, you can contact Franz. Franz is CEO of Portland Labs, the maker of concrete5.
https://www.concrete5.org/profile/-/view/6/...