The "DeepL Pro 1.11.0 Portable" is an illegitimate software build. While it may offer the allure of a "free" Pro subscription without installation, the associated risks regarding data privacy, malware infection, and operational instability far outweigh any utility. The age of the specific version (1.11.0) further suggests it is likely incompatible with current DeepL server protocols.
If you have encountered a "portable" version from an unofficial source, it is important to note the differences in security and features: Official DeepL Pro Data Security deepl pro 1110 portable