If you cannot find the patch via self-service, open a Service Request (SR) with Oracle Support. Explain that you need Forms 6i Patchset 19 (6.0.8.19.0) for a legacy system. Oracle may provide a secure FTP link, though they often try to upsell an upgrade to Oracle Forms 12c.
Once you have legally obtained the p2260838_19_WINNT.zip file, follow these steps. Always perform this on a development or test environment first.
A: No. Forms 6i remains a 32-bit application. Patch 19 improves compatibility but does not convert the binary to 64-bit.