[SOLVED] SSMS 18.4 installation will not run

SSMS 18.4 installation will not run

I am having trouble installing SSMS on a fresh installation of Windows 10 - on a new Dell XPS 15.

I am installing the latest version (18.4) from here: https://learn.microsoft.com/en-gb/sql/ssms/download-sql-server-management-studio-ssms

When I run SSMS-Setup-ENU.exe I get the User Access Control dialogue, I say Yes and nothing happens.

I cannot see any processes starting in Task Manager.
Logs indicate that the installationg cannot start. From googling this error suggests that I'm missing a version of dotnet framework.

I have installed Visual Studio 2019 + all the dotnet frameworks (everything from 4.6 to 4.8) + Dotnet Core.

Does anybody have any ideas - what am I missing or doing wrong? :/

Thanks for your help!

Error (ommitting all of the noise)

[2E90:33E8][2019-12-09T10:55:43]i000: Loading managed bootstrapper application.
[2E90:33E8][2019-12-09T10:55:43]e000: Error 0x80131902: Failed to create the managed bootstrapper application.
[2E90:33E8][2019-12-09T10:55:43]e000: Error 0x80131902: Failed to create UX.
[2E90:33E8][2019-12-09T10:55:43]e000: Error 0x80131902: Failed to load UX.
[2E90:33E8][2019-12-09T10:55:43]e000: Error 0x80131902: Failed while running 
[2E90:33E8][2019-12-09T10:55:43]e000: Error 0x80131902: Failed to run per-user mode.
[2E90:33E8][2019-12-09T10:55:43]i007: Exit code: 0x80131902, restarting: No

Installed dotnet framework

PS C:\> wmic /namespace:\\root\cimv2 path win32_product where "name like '%%.NET%%'" get version
Version
4.5.50932
4.8.03928
4.6.01055
4.7.02558
4.5.50710
24.64.28315
3.0.1.0
4.8.03761
3.0.1.014347
13.0.19213.0
4.7.03081
4.7.02053
12.16.14727
24.0.28113
4.7.02558
3.1.0.0
4.7.03062
12.2.18292.0
3.1.0.014727
12.0.30731
24.64.28315
2.1.14.014727
1.0.20910.0
4.6.01590
4.7.02053
24.4.28216
4.8.03928
2.1.14.0
24.64.28315
4.8.03761
4.8.03928
3.0.0127.060
3.1.0.0
16.120.28209
4.6.00081
24.64.28315
3.1.100.014727
3.0.1.0
24.64.28315
24.4.28216
4.0.30319
3.1.0.0
4.5.51651
4.7.02558
4.6.01055
4.7.02558
4.6.01590
24.64.28315
24.64.28315
24.64.28315
3.0.1.0
24.0.28113
24.4.28216
16.4.457.38025
4.6.01590
4.7.03062
24.64.28315
3.0.1.014727
24.4.28216
4.7.02053
24.4.28216
4.6.01055
24.64.28315
4.8.03761

Solution

Argh I have worked out my problem - it's pretty dumb.

I forgot that I updated the machine.config with some settings but there was a mistake and missing a closing ". This meant that the configuration was invalid and therefore the installer wouldn't run. 🙈🙈