Problem uploading Garmin to Strava

Usually just connect Garmin to computer and the device displays on the Strava page , but yesterday it wanted to update to Garmin Communicator Plugin , so I have downloaded it succesfully it says but now I can't get past this screen saying Upload Garmin Communicator plugin , not at all tech savvy and am stuck , can anyone help , thanks .
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In IE9+, use F12 or the Settings menu to open the Developer page. Then in the Emulation page (usually the bottom icon on the left toolbar), change Document Mode to 9. This will cause the page to reload and recognise the GCP. In theory you should need to do this only once but I've found IE doesn't remember the setting and I have to do it each time on the Strava Upload page.
Never use IE!
You can always manually upload an activity from your device to Strava without needing a plugin etc, just treat your device as a memory stick.
I did a factory reset and it started working again.
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Select the option upload, from the four options now available of the lhs of the page choose "from file", now choose "browse" in the dialogue box that opens navigate to your actvities folder either on the garmins own internal memory or the micro sd card if you have one and have chosen to save your activities there. Pick the relevant "fit" file.
Viola bobs your fathers brother or something like that.
Well this is strange, I had to install IE whatever it is on now as Chrome wouldn't work when trying to upload to Strava, just sits there stuck partly uploading.
Maybe I need to try again?
This is definitely a better solution than Load From File, which took multiple page reloads on IE to get it working.