Problem installing ImageMagick 7 using IMEI

I tried to install ImageMagick 7 by IMEI from github:

https://github.com/SoftCreatR/imei/

but always had this answer:

   Signature verification failed! Please check /var/log/imei.log for details.

and in imei.log:

./imei.sh: line 283: : No such file or directory./imei.sh: line 286: : No such file or directoryCan't open  for reading, No such file or directory140131941683840:error:02001002:system library:fopen:No such file or directory:../crypto/bio/bss_file.c:69:fopen('','r')140131941683840:error:2006D080:BIO routines:BIO_new_file:no such file:../crypto/bio/bss_file.c:76:unable to load key file

My current version is 6.9.10-23, but it seems not working correct with jp2 encoding (don't create a jp2, but a tiff called jp2).I have version 7.1.0-2 on win10 and it works fine!So I want to install latest version of this software, and as I read in some discussion, I try to install by IMEI.

How can I have IM7?

mg