Zombie Panic Source lib errors

--- debian sid 5.8.15, kde 5.17.5, nvidia 455.23.04 ---
--- game not working, error message after intro movie ---
--- engine error: could not load library client ---

...../Zombie Panic Source/zps/bin$ ldd libcurl.so
./libcurl.so: /lib/i386-linux-gnu/libssl.so.1.0.0: version `OPENSSL_1.0.1' not found (required by ./libcurl.so)
./libcurl.so: /lib/i386-linux-gnu/libssl.so.1.0.0: version `OPENSSL_1.0.0' not found (required by ./libcurl.so)
./libcurl.so: /lib/i386-linux-gnu/libcrypto.so.1.0.0: version `OPENSSL_1.0.0' not found (required by ./libcurl.so)
        linux-gate.so.1 (0xf7f26000)
        liblber-2.4.so.2 => /lib/i386-linux-gnu/liblber-2.4.so.2 (0xf7e1f000)
        libldap_r-2.4.so.2 => /lib/i386-linux-gnu/libldap_r-2.4.so.2 (0xf7dc1000)
        libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xf7d9f000)
        libssl.so.1.0.0 => /lib/i386-linux-gnu/libssl.so.1.0.0 (0xf7d33000)
        libcrypto.so.1.0.0 => /lib/i386-linux-gnu/libcrypto.so.1.0.0 (0xf7b2a000)
        libz.so.1 => /lib/i386-linux-gnu/libz.so.1 (0xf7b0d000)
        libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf7924000)
        libresolv.so.2 => /lib/i386-linux-gnu/libresolv.so.2 (0xf790b000)
        libsasl2.so.2 => /lib/i386-linux-gnu/libsasl2.so.2 (0xf78ec000)
        libgnutls.so.30 => /lib/i386-linux-gnu/libgnutls.so.30 (0xf76fd000)
        /lib/ld-linux.so.2 (0xf7f28000)
        libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xf76f5000)
        libp11-kit.so.0 => /lib/i386-linux-gnu/libp11-kit.so.0 (0xf75a0000)
        libidn2.so.0 => /lib/i386-linux-gnu/libidn2.so.0 (0xf757e000)
        libunistring.so.2 => /lib/i386-linux-gnu/libunistring.so.2 (0xf73fc000)
        libtasn1.so.6 => /lib/i386-linux-gnu/libtasn1.so.6 (0xf73e5000)
        libnettle.so.8 => /lib/i386-linux-gnu/libnettle.so.8 (0xf73a1000)
        libhogweed.so.6 => /lib/i386-linux-gnu/libhogweed.so.6 (0xf7358000)
        libgmp.so.10 => /lib/i386-linux-gnu/libgmp.so.10 (0xf72c9000)
        libffi.so.7 => /lib/i386-linux-gnu/libffi.so.7 (0xf72bf000)

--- copy 32 bit versions of libssl.so.1.0.0 & libssl.so.1.0.0 to ...../Zombie Panic Source/zps/bin/ ---
--- test by preloading the bin directory ---

...../Zombie Panic Source/zps/bin$ LD_LIBRARY_PATH=. ldd libcurl.so
        linux-gate.so.1 (0xf7fa8000)
        liblber-2.4.so.2 => /lib/i386-linux-gnu/liblber-2.4.so.2 (0xf7ea1000)
        libldap_r-2.4.so.2 => /lib/i386-linux-gnu/libldap_r-2.4.so.2 (0xf7e43000)
        libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xf7e21000)
        libssl.so.1.0.0 => ./libssl.so.1.0.0 (0xf7dc8000)
        libcrypto.so.1.0.0 => ./libcrypto.so.1.0.0 (0xf7c0e000)
        libz.so.1 => /lib/i386-linux-gnu/libz.so.1 (0xf7bf1000)
        libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf7a08000)
        libresolv.so.2 => /lib/i386-linux-gnu/libresolv.so.2 (0xf79ef000)
        libsasl2.so.2 => /lib/i386-linux-gnu/libsasl2.so.2 (0xf79d0000)
        libgnutls.so.30 => /lib/i386-linux-gnu/libgnutls.so.30 (0xf77e1000)
        /lib/ld-linux.so.2 (0xf7faa000)
        libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xf77d9000)
        libp11-kit.so.0 => /lib/i386-linux-gnu/libp11-kit.so.0 (0xf7684000)
        libidn2.so.0 => /lib/i386-linux-gnu/libidn2.so.0 (0xf7662000)
        libunistring.so.2 => /lib/i386-linux-gnu/libunistring.so.2 (0xf74e0000)
        libtasn1.so.6 => /lib/i386-linux-gnu/libtasn1.so.6 (0xf74c9000)
        libnettle.so.8 => /lib/i386-linux-gnu/libnettle.so.8 (0xf7485000)
        libhogweed.so.6 => /lib/i386-linux-gnu/libhogweed.so.6 (0xf743c000)
        libgmp.so.10 => /lib/i386-linux-gnu/libgmp.so.10 (0xf73ad000)
        libffi.so.7 => /lib/i386-linux-gnu/libffi.so.7 (0xf73a3000)

--- game works now by launching normally in steam ---