Regarding topic 3) in Upgrading nopCommerce
3.You have to upgrade stepwise. For example, if your current version is 2.00 and the latest available version is 2.30, then you have to upgrade to 2.10, then to 2.20, and then to 2.30. So download the required upgrade scripts from our Downloads page.
Are there any special instructions when previous version is 1.x?
Regarding the Documentation Page
I would also include something alike the Touble Shooting paragraph of Upgrading nopCommerce with the folowing additions
If you have any questions, you can always search or
post a question on our forums.If when doing advance search you cannot find what you need, , then try a Google search focused into NopCommerce site:
[your search words site:nopcommerce.com]