Never trust a pre-verified hash from an online forum. Always verify the digital signature or checksum yourself using the official OpenVPN website. For version 3.8.0.4528, the valid digital certificate is the strongest proof of authenticity.
No legitimate OpenVPN Connect MSI file will ever have spaces in its name. The exact official filename is typically OpenVPNConnect_x64_3.8.0.4528.msi or similar. The spaces in x64 openvpnconnect3804528msi verified likely represent how the keyword is being typed into search engines, not the literal filename.