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We have an Umbraco website v4.7.2 that will need to be upgraded to v6.1.1. This is a fairly straightforward process, with strong attention to detail in the upgrade process required. We have a few forms, and some installed packages as well (including Umbraco Contour and Umbraco Courier). I'm sure a few of the installed packages will need to be upgraded. Again, STRONG attention to detail is required, as many of the config files may need to be manually verified using a program such as WinMerge etc.
You will need to upgrade one version at a time - and then TEST to make sure everything is functioning ok. You will not be able to upgrade directly from 4.7.2 -> 6.1.1.
Please *only* respond if you have a experience with and a strong understanding of Umbraco.
The process should now take more than a few hours or so.
I look forward to hearing from Umbraco Devs!