With the 32-bit Strategy for Office installer (legacy Office) delivered with Strategy 2021, the add-in does not load and Excel crashes and/or displays an error message like the following.
Excel experienced a serious problem with the 'Strategy office' add-in. If you have seen this message multiple times, you should disable this add-in and check to see if an update is available. Do you want to disable this add-in?

This issue was addressed in Strategy 2021 Update 3. Please consider upgrading to take advantage of the fix.
Use the 32-bit installer from a previous version, for example, Strategy 2020 Update 4.