Opaque,
I just did a 'fresh' download from
http://www.smorgasbordet.com/pellesc/900/setup.exeName: setup.exe
Size: 14037409 bytes (13 MiB)
CRC32: B643C36D
CRC64: 2A3472E5D7319E35
SHA256: 31E5F43311377A819CDDA7452FC9E3470F961DE63777806627705B7BC2441458
SHA1: 4210FFB3C596DC0021AFE9FC8D9FFCBFD008063E
BLAKE2sp: DADBC0CE31A2651CC8FF78B2249BCDD029DBB6BB7F3C3D07C38AB5532BF912A8
All of the checksums match my older download just fine. I then did a new install on a Win 10 64 bit system
that never had the program before and it ran without any errors.
You are getting an error but I suspect it has an incorrect cause reported.
Various things to try might be
1) using a different browser to perform the download,
2) try to run the setup as administrator,
3) try disabling your antivirus scanner during the download and or installation.
Regards