Although I have downloaded some 25 or more plugin’s NONE show up on the page you indicate. (A few are Fredo6’s and only on Sketucation). The ‘my downloads’ on EW is blank.
Look I am a one-man shop, I don’t have the privileged of programming solutions, I just need to get back to work. I have been a faithful user of Sketchup since Google days. Every year I expect to see someone with a lot more expertise than I, make the routine that will read the previous year’s plugins and check to see if they will work the current year, then install them.
I am sure there are many others who wish the same thing. In fact, my recollection is that this exact subject was discussed way back at SU7 or SU8 as a “WISH LIST” item.