To validate that the file you've downloaded is not damaged and is the file that was meant to be downloaded, you should download also:
.asc file that accompanies the file you've downloaded (the files have the same name, one just has an additional .asc extention),imyplay-X.Y-sign-key.asc file, which contains the signing key.Then, get GnuPG (or Gpg4Win), and:
gpg --import imyplay-X.Y-sign-key.ascgpg --verify imyplay-X.Y.tar.gz.asc. If it says "Good signature", then everything is correct.To install the RPM packages, simply run rpm -Uvh imyplay-X.Y-*.x86_64.rpm.
To install with signature verification, first import the key from the imyplay-X.Y-sign-key.asc file to RPM: rpm --import imyplay-X.Y-sign-key.asc, and then install the RPM packages as above.
To install IMYplay using the binaries for DOS (the imyplay-dos-X.Y.zip file), just unpack the archive and copy the files you need to your chosen location. The imyplay.exe file is (obviously) required.
Just double-click to run, and follow the displayed steps: choose what to install and where to install.
In order to verify the correctness of the installer:
imyplay-X.Y-root-cert.der file,imyplay-X.Y-sign-cert.cer file.certmgr.msc.imyplay-X.Y-root-cert.der file to "Trusted Root Certification Authorities".imyplay-X.Y-sign-cert.der file to "Trusted Publishers"/"Certificates". If the installer still shows that the publisher is unknown, add this file also to "Trusted Root Certification Authorities".To install IMYplay, just double-click to run, and follow the displayed steps: choose what to install and where to install.