Shrapnel Games is having New Year sale for the whole of January. The salle covers most of their existing title in the store page but the most popular ones being winSPWW2 and winSPMBT and this is a great chance for you want to grab both of them.
You can get the free version of the games but you can’t play them in modern high-resolution settings instead you’ll be stuck at 800×600 and missing a huge chunk of missions even though I highly doubt you can play through all of their free ones anyway.
These two games, as far as I know, are also updated regularly. The last update for winSPWW2 and winSPMBT was in 2020. If you’re still on the fence you can always download their free version and try out a few missions which I am sure you would find as engaging as any other wargames out there.
Here are links to both of them: