I have Devel 8.x-1.2 installed and need to upgrade to 8.x-2.0 but I cannot install Composer/Drush on the server as it is not included in the hosted service. Any guidance how can I execute this upgrade?
Click the tarball or zip file link, extract folder. Upload devel folder to /modules folder.
Then run update.php by going to
yourwebsite.com/update.php and then flush all caches.
Note that if the module requires any external dependencies this will not work.
Indeed, I don't believe this is the case for Devel. But if your module has external dependencies and must be installed via composer. Simply in a local or some other environment install it using composer and then upload all the files that were installed, including the /vendor directory files.