i could make a screenshot but the txt would be the same so i just give you the error txt once more
0 - Argument 2 passed to ProductHelper::canDownload() must be an object, string given, called in /var/www/joomshaper.com/html/components/com_product/controllers/download.php on line 45
just noticed that this goes for others of the extension some work download for other through the same error
some mention here with this problem
Medical - kindergarten - movie database - soccer - LMS
and off course pagebuilder pro 3.8.10 say buy me !
hope my check up will help you find the source