Make changes in website designed in Dreamweaver

Be careful not to confuse the relationship between Dreamweaver and Contribute.
Contribute is not a light version of Dreamweaver, it is a form of extension that simulates the use of a back office. The developer used Dreamweaver to create 'contribute' spaces that could be accessed and modified from a simple browser by authorized users.
But Contribute as such could not intervene otherwise on the site.
Was the site you are referring was developed with Dreamweaver using the Contribute extension?

No.  Contribute is discontinued, outdated and no longer sold or supported.  Even if you find a copy, it's unlikely to work because Adobe stopped developing Contribute a long time ago.

If you can work with code, download free Adobe Brackets or Microsoft's Visual Studio Code. Use Filezilla or Cute FTP client to transfer files to server.  Keep in mind, old sites don't do well on the modern web because too many things have changed. It might be best to start over fresh with modern tools and modern code.

-- Adobe Behance (free online service) - https://help.behance.net/hc/en-us/articles/204483894-Guide-Intro-to-Behance
-- Adobe Dreamweaver CC  (desktop software)- https://www.adobe.com/products/dreamweaver.html
-- Adobe Portfolio (free online service with a paid Creative Cloud Plan) - https://portfolio.adobe.com/
-- Bootstrap Studio (desktop software) - https://bootstrapstudio.io/
-- Pinegrow (desktop software) - https://pinegrow.com/
-- Squarespace (online service) - https://www.squarespace.com/
-- Webflow (online service) - https://webflow.com/
-- Wix (online service) - https://www.wix.com/
-- WordPress (open source CMS) - https://wordpress.org/

Contribute has not been around in quite some time, and I imagine your copy of DW is probably from around the same time period.  The short answer is that all the sites produce is code.  While the UX-based functionality of the Contribute/DW setup may no longer work, your site is not locked so you can still edit code if needed.  So even if you no longer wanted to maintain your code or invest in the software, any web developer should be able to make some updates in the code of your site.

Alternatively, as out of date as that combination is, the code produced is probably in need of an update and given the state of SEO, a better alternative may be looking to move your site to a more modern, or mobile-friendly CMS structure to serve up your site.

Hi Phil,

what concerns "Contribute", please have a look there:

https://www.adobe.com/support/contribute/downloads.html 

there see Downloads >>> The following types of Contribute downloads are available on this page.
and see "IMPORTANT".

On the other hand - it depends how long you need DW, you could use a test version:

https://www.adobe.com/products/dreamweaver.html?gclid=EAIaIQobChMI_druq9X56wIVAs53Ch15-QnAEAAYASAAEgJ52_D_BwE&sdid=88X75SKP&mv=search&ef_id=EAIaIQobChMI_druq9X56wIVAs53Ch15-QnAEAAYASAAEgJ52_D_BwE%3AG%3As&s_kwcid=AL%213085%213%21341205978628%21b%21%21g%21%21%2Bdreamweaver+%2Btestversion%211418179439%2161279095568 

Hans-Günter