I need help converting Truecrypt volumes to Veracrypt

[raguse]

@Standard_Mixture

but the current version would not open it.

Have you checked if the previous (from truecrypt volume) encryption algorithm respectively hash algorithm is still supported? Some hash algorithm have been dropped with the new version.

Complete removal of RIPEMD160 and GOST89 algorithms. Legacy volumes using any of them cannot be mounted by VeraCrypt anymore.

@Standard_Mixture

Also, the converted volume now takes maybe 12 seconds to open instead of about 1.

That also depends on the chosen hash algorithm. Some require more time to open the container than others. Per default autodetection is used and that takes some more time because it tests through available methods.