Safari unable to download files

1 - Are any of these types of Applications installed on you iPhone ?

2 - Are any of these Applications installed on this Computer ?

3- Any of the below should be removed as per Developers Instructions 

4 - This includes AntiVirus, Disk Cleaners, Disk Optimizes, UnInstaller etc.

5 - This is the Official Apple Support method Import or export calendars on Mac - Apple Support (CA)

6 - As for Bank Statements and here I maybe parsing our words.

7 - Any Bank or Financial Institution I have every dealt with, generally have used the Universally Accepted .PDF Format which will again and generally open on the native Preview Application.

8 - If the user is referring Bank Statement Data - this is a very different matter. Those are offered in various file formats and are Imported to the Financial Software installed on this computer.

9 - refer to below

1 - Any of the below should be removed as per Developers Instructions 

Unanswered

2 - This includes AntiVirus, Disk Cleaners, Disk Optimizes, UnInstaller etc.

Unanswered

3 - Does this computer belong to a Company or University or Organization and a Profile was required to be installed ? If so, they Control this computer and what can be downloaded or Not downloaded.

4 - Parental Controls are enabled by the Guardian - Parent and they control this computer and what can and can not be done on this computer.

5 - If none of the above Find an Apple Authorized Service Provider or Visit a Genius at an Apple Store and have them evaluate this computer. They have all the Special Hardware Tools and Software Tolls to find out where the issue is any may be able to fix it.

6 - Since were are working Remotely and can not see the computer in person - at this point , can to with good conscience see any other options.

Safari >> Preferences >> Websites >> "Downloads " on left category and at bottom " When visiting other Website " >> " ASK"

Is " Ask " marked or " Deny " or " Always " ?

Added is the Website listed like some in my Safari setup ?

Please refer to below.

Suggest downloading the Application Etrecheck directly from a well Respected ASC Contributor. And Safe to use.

The application is free or paid from added features. 

Run the application with Full Disc Access ( Security & Privacy - Full Disc Access ).

It will take a Snap Shot -  both the hardware and software.

 The Report will Not Reveal Any Personal Information. 

We can have a look at the report for possible issues and may have possible suggestions to resolve the issues.

Then it would appear the .ics file from that specific site has the issue and not Safari itself.

iPhone use a different Operating System iOS and Apple Computers run macOS

The ics file from that Specific Site - does it specifically mention for iOS or macOS ?