Cilensek got some attention way back in GDR-times. A record shop in East Berlin - in the mid 1980s - had a good collection of East German LP pressings of which this compilation made it to CD:
https://www.hbdirect.com/album/1231587-johann-cilensek-orchesterwerke-1959-1974.htmlAlso there's this NOVA collection with his symphony No.4 on it
https://www.discogs.com/Various-NOVA-Sinfonik-in-der-DDR-East-German-Symphonies/release/9654162I can recommend the NOVA-set; it has very informative notes and the recordings are excellent stereo.