A WKL control or the reference is missing (wrong bitness)

One of these happens:

• The WKL controls are missing from Form Design › Controls › ActiveX Controls.
• Tools › References marks WKL Forms x.y Object Library as MISSING („NICHT VORHANDEN“).
• New WklToast or New WklLinkManager fails with run-time error 429 („ActiveX component can't create object“).
• A form opens with an empty white rectangle where a WKL control was.

Every release of the WKL Forms Object Library, on PCs where the control is not registered for the bitness of Office or for the current Windows user.

• Other bitness. A DLL serves one bitness only. 32-bit Office loads the x86 files, registered with the regsvr32 of %windir%\SysWOW64; 64-bit Office loads the x64 files, registered with the regsvr32 of %windir%\System32. Windows keeps the registrations of the two bitnesses apart.
• Other Windows user. A registration with /n /i:user belongs to the user who ran it. Another user of the same PC sees nothing.
• Folder moved or deleted. The registration points to the folder the DLL was registered from.

1. Find the bitness of Office: File › Account › About Access.
2. Register the DLL of that bitness for the current user, as in How to: Install the released package, step 4.
3. Close and reopen the database, so that Access resolves the reference again.