To install WinCC Flex on Windows 10:

1. The following MSI files do contain string to be modified with InstEd:

\InstData\ALM\Setup\ALM32\Setup.MSI
\InstData\ALM\Setup\ALM64\Setup.MSI
\InstData\OPCXMLGateway\Setup\Setup.MSI
\InstData\ProSave\Setup\Setup.MSI
InstData\RT\Setup\Setup.MSI

Search for DLG_INSTALLATIONREQUIREMENTS_DISABLE_IGNORE. Change Action from Disbale to Enable.

2. The OS mod for Win10 [Copied from thread ref STEP 7 v5.5 in Win10]:

Modify InstData\Setups.Ini, section [OS]: Add

Win61x64=1
Win81x64=1
Win8x64=1
Win62x64=1
Windows61=1
Windows61x64=1
Win8x64Exclude=SKU2;SKU3;SKU5;SKU8;SKU9;SKU10;SKU11;SKU12;SKU13;SKU14;SKU15;SKU16;SKU17;SKU18;SKU19;SKU20;SKU21;SKU22;SKU23;SKU24;SKU25;SKU47;SKU66;SKU67;SKU68
Win8x64Warning=SKU2;SKU3;SKU5;SKU8;SKU9;SKU10;SKU12;SKU13;SKU14;SKU15;SKU16;SKU17;SKU18;SKU19;SKU20;SKU21;SKU22;SKU23;SKU24;SKU25;SKU67;SKU68

3. Install newest version of Automation License Manager [one from TIA PORTAL v14 SP1]

4. install WinCC Flex 2008. Press the ingore-button when told it's not possible to install on running OS.

5. if needed install SimaticAutomationTool with device drivers, etc.

NOTE: Officlaly, WinCC Flex 2008 does not support windows 10 BUT it is getting difficult
to source laptops with Windows 7 on them. Siemens should do something about it
and about TIA V13 WHICH IS NEEDED TO UPGRADE OLDER PROJECTS TO TIA V14
OR in case of TIA PORTAL provide project converter which works in Win10!!!

Here download WinCC Flexible 2008 on Windows 10

https://support.industry.siemens.com/cs/document/100777999/simatic-wincc-flexible-2008-trial-download?dti=0&lc=en-WW

Information:

https://support.industry.siemens.com/cs/document/109749111/delivery-release%3A-service-pack-5-for-simatic-wincc-flexible-2008?dti=0&lc=en-WW

hi

you can install update

https://support.industry.siemens.com/cs/us/en/view/109757233