Manjaro includes Wine in its repositories, which makes installing Wine easy. Begin by clicking the icon in the lower left corner of the desktop. Then click System > Add/Remove Software and search using the keyword wine.
In the window that opens, select from the following mandatory and optional packages by clicking the corresponding Install button on the right.
After selecting the above, click Apply, and, when asked about "optional dependencies", select all of them unless you have a specific reason not to.
As soon as installation of all packages is complete, open a Terminal window and issue the following command to verify a successful installation.
$ wine --version