In the event that you need to downgrade your version of Capture One Pro, you may navigate to the Download Archive section of the Capture Integration website:
https://support.captureone.com/hc/en-us/categories/360000430178-Release-Notes
Once you are on the page, go to the version you are looking to download and there will be a link to download within the installation instructions.
All previous versions can be found here: https://www.captureone.com/en/account/download/previous