All of Blackbaud's SSRS changes are completed with a tool that was built by Blackbaud for Blackbaud hosted customers only. This tool is unavailable to use by any customer-hosted or not. 

There is a tool our hosting team recommended that could be used in it's place: 
<https://code.google.com/archive/p/reportsync/downloads>.  

This will allow you to move reports from one environment to another.  Just using the tool to move the reports won't make the change though so here is what you would need to do:
  1. Download the HTML Reports using the tool 
  2. Open all the reports at once using NotePad++ 
  3. Press CTRL + F and click on the Replace tab 
  4. Enter the correct values and press Replace All in All Opened Documents 
  5. Click the Save All button 
  6. Use the Tool to upload the reports to the new environment 
Note: We provide links to third-party websites in an effort to help you resolve your issue. We are not responsible for the information on third-party websites and we cannot assist with implementing resolutions from these websites.