The trick I used to get around this is covered in this thread from Microsoft. Short version: You can't install VC Redist 2015 if the 2017 variant is in place.
You can use the above trick from Rolo42 but (I'm completely theorizing) that may leave later installs of other software confused about which redist is present. It could end up just fine, too. 2017 is an equal substitute for 2015, which is why ESO doesn't freak out even after that annoying pop-up alert.
What I did was:
1. Uninstall VC Redist 2017 from Programs and Features
2. Install VC Redist 2015.
3. Re-install the 2017 packages (Download links for x64 and x86).
Soon as I did this, all issues were resolved. Again credit to Rolo42 above, and the folks on the Microsoft thread.
Simple way to resolve the issue:
- Go to https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads
- Download and install redistributable packages for Visual Studio 2015, 2017 and 2019
- x86: vc_redist.x86.exe
- x64: vc_redist.x64.exe
P.S. what a trash technical support