Typically Ctrl+F5 will refresh the HTML page but may not help with a complete tour.
It is never a good idea to upload "corrections" to the same directory/naming.
You "could" remove from the server and have the viewing attempt to call the tour (that is now gone) and this should purge the old away. Then upload the new and have them check back.
Cache can be very difficult to overcome if people don't co-operate. Always better to rename and maybe write or add an auto re-direct to the new page.
Putting all "local" cache aside, you also can other cache issues when the ISP that the viewer uses to connect to the Internet can cache your pages on their server and this is delivered to the client, even though you have updated and they have cleared their local cache the ISP keeps providing old data. Typically ISP purge cache only once or twice a week. Neither YOU nor the CLIENT has any control over this.