Delaying Windows 7 to Windows 10 upgrade

I find reinstalling the operating system to be a hassle that should be postponed until system instability arises. I would like to postpone upgrading Windows for as long as possible.

A window has come up titled "Get Windows 10" and it's talking about reserving and installing Windows 10. If I reserve Windows 10 does that impose a short time limit in which to install?

Additionally, I'd rather the major bugs following mainstream release were worked out before I got around to installing it.

You have 1 year to take advantage of the free upgrade offer. You don't have to be "among the first", so just ignore the upgrade reservation until you decide you want it.