Hello,
Installing Designer 6 leave Windows 10 search bar inoperable,
I found a workaround that works, you must change the values of these two registry keys as follows:
[HKEY_LOCAL_MACHINE\Software\Microsoft\ole]
"ENABLEDCOM"="Y"
"LEGACYAUTHENTICATIONLEVEL"=dword:00000002
"LEGACYIMPERSONATIONLEVEL"=dword:00000002
Thanks