QB Issue Resolution:

If you wait for several minutes does it come up with an alert showing an error? Sometimes bank and credit card web sites have issues with traffic.

If you have more than one account online, try selecting one at a time from the pop up on the left top of the Download Transactions window. Then press the “download” button (but not “download all”). This may enable you to download from the other accounts (and also figure out which account is currently experiencing difficulty).

Or it could be something else – but this is what comes to mind.

Resolution for Issue 'download all button is freezing' available: Yes (Solved).
Source: Intuit Community forum.

download all button is freezing: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for download all
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Error Recovery for download all [Canada]
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