In regards to updating ‘old’ conky scripts, there is a .lua program for changing the syntax to the new standard that is freely available - it may even be included with what you have. If not - I can certainly forward it to you.
As mentioned, the Rain meter stuff looks like Windows, not Linux - although it may have some similarities with ‘Rainlendar’ on Linux - not a conky anyway.
It does not appear there is anything tricky about the last one, although it is pretty ‘simple’ as conkys go. If you look at old threads here about conky, you might find an example conky or two that you like and come with ‘instructions’ - one I recall setting up for a Deepin setup a while back… If you can get that going (whether on your own or with help) you will be much better placed to handle the others…
(yes, I answer conky questions...)
Edit: a search with the magnifying glass @ top right for conky cpu should point you to the thread from April with examples and some discussion of setup. Also it was on a Deepin thread, came up second when I tried the search.