As far as I know, you are not required to agree to the GPL to make personal use of GPL-licensed software. You are only required to agree to the GPL to redistribute the software. The GPL prohibits distributors that have licensed the software under the GPL from imposing additional restrictions on the software. Forcing users to agree to the GPL to make personal use of GPL-licensed software could be seen as imposing an additional restriction.
However, some software installers require agreeing to whatever the license may be before using the software. That may be a proprietary license but it also might be the MIT license or the GPL. If the installer is provided by a non-copyright owner that licenses the software under the GPL, is it legal to distribute an installer requiring users to agree to the GPL before using the GPL-licensed software?
This question is closely related to this other question but is not covered by that question.