If instead you'd like to go downloading the fixed pages as you need, you can delete all the contents of the internal/help folder (they are all text files with the exception of one links.bin, which can be safely removed).
After you do that, launch QB64 and go to Help->Keyword Index. That'll download the main help page with the links to the new keywords added recently.
From then on, you can simply type a keyword in your program and hit F1 to download the desired help page.