Construct 3 free version questions

Question #1: Where do I go to legally download free version of Construct 3 please?

Question #2: How many objects can I have in a game made with free version of Construct 3 please?

Question #3: How many rooms can I have in a game made with free version of Construct 3 please?

Question #4: Where in Construct 3 do I go to upgrade to a better version of Construct 3 (example buy online Construct 3 then get emailed code then in Construct 3 go to File then Code Enter then enter code to upgrade Construct 3) please?

I thought the construct website was easy to navigate. Anyways, there is no download, construct 3 is web based and you can find a link to it on this website.

To buy (or rather pay for a subscription) you go to this link, which should be simple to find anyways. Any limits the free version has is listed toward the bottom of the page.

construct.net/en/make-games/buy-construct

Thank you.